Learn about stones — their color, price, and more. Browse through our list of precious, semi-precious, and lab-created stones and learn about their value for jewelry.

Actinolite View Profile

Actinolite is a member of a series that contains varying amounts of iron and magnesium. Tremolite is the Mg end, and ferroactinolite the Fe end, with actinolite in the middle. Actinolites with more than 50% Fe are very rare. Catseye actinolite exists (S.G. 3.0, R.I. 1.63); when chatoyant material is cut, it exhibits a fine eye. Actinolite is easy to cleave and hard to cut and woul...

adamite - ojuela
Adamite View Profile

Although adamite occurs in many localities, it's very rarely cut as a gem. This mineral is much too soft and fragile for jewelry. However, collectors prize its intense fluorescence.

Agate View Profile

Agate is a variety of chalcedony that exists in many colors and is often commercially dyed. Agate is distinguished by having multiple colors. While not usually as rich as our crystalline gems, the colors can be quite vivid. Agates are sometimes opaque, but they are frequently translucent, and occasionally completely transparent.

albite - sri lanka and new mexico
Albite View Profile

Albite, usually colorless but sometimes yellow, pink, gray or reddish. Translucent albite is sometime colored green by chrome jadeite. It is also a component of trachipe emeralds.

natural alexandrite - engagement ring
Alexandrite View Profile

“Emerald by day, ruby by night,” alexandrite is well known for displaying one of the most remarkable color changes in the gem world — green in sunlight and red in incandescent light. However, the modern June birthstone is so rare and expensive few people have seen a natural alexandrite. This variety of gem-quality chrysoberyl makes an excellent jewelry stone.

algodonite - michigan
Algodonite View Profile

Cabochons of these arsenides are bright, silvery, and metallic and are both attractive and unusual. However, they tarnish rather quickly and the surfaces turn a drab brown and lose their luster. Cut stones are rarely seen even in collections, although they are strikingly beautiful when cut and polished to a high luster. They must be sprayed with lacquer to prevent tarnishing. Algodo...

almandine garnet ring - 19th century German
Almandine Garnet View Profile

Almandine is perhaps the most common garnet species. Forming series with pyrope and spessartine garnets, these gems occur in the deep brownish or purplish reds most often associated with garnets. They make affordable and durable jewelry stones.

cut amazonite
Amazonite View Profile

Amazonite is a variety of microcline, which is itself a variety of feldspar.

Amber - gems and objects
Amber View Profile

Amber is classed in various types: sea amber (found in the sea), pit amber (dug up, especially from the Baltic area), clear, massive, fancy, cloudy, frothy, fatty, and bone amber.

amblygonite - brazil
Amblygonite View Profile

Amblygonite gems are usually pale straw yellow. Although they are too soft and cleavable to make good ring stones, collectors prize them if they show darker colors. Large faceted stones are extremely rare.

amethyst brooch
Amethyst View Profile

Amethyst is crystalline quartz in colors ranging from pale lilac to deep reddish purple. The February birthstone makes a fine, durable gemstone for all purposes, from jewelry to carved objects.

Ametrine - Bolivia 24.64 cts
Ametrine View Profile

Ametrine is a variety of quartz that displays bands of both amethyst purple and citrine yellow. These gems are typically cut to showcase their dramatic color zoning.

ammolite - Dinosaur Expo
Ammolite View Profile

In 1981, ammolite became recognized by CIBJO, (the Colored Stones Commission.) It is the latest of only three new gemstones introduced in the last 50 years. It is also only one of three organic gemstones, (including amber & pearl.) It has been compared to opal and has a superficial similarity to the Austrian mineral lumachelle whose iridescence is also provided by the fossil amm...

Analcime View Profile

Large colorless crystals of Analcime are a great rarity although small transparent crystals are abundant. Faceted gems are extremely rare and seldom seen even in large collections. The hardness is marginal for wear, but the mineral has no cleavage and should present no difficulties in cutting.

anatase, blue crystal - Norway
Anatase View Profile

Anatase occurs in many beautiful colors, such as deep indigo and amber yellow. However, these rare gems are seldom transparent and are usually found as very small crystals. They're hardly ever faceted, except as curiosities for gem collections.

round brilliant andalusite - Brazil
Andalusite View Profile

Strongly pleochroic, andalusite can show shades of green, brown, and red when viewed from different directions. Although tough enough for most jewelry uses, this strikingly beautiful stone is largely unknown to the gem buying public.

Andesine View Profile

These feldspars are rarely encountered in gem form. Andesine's occurrence is widespread throughout the world, in a great variety of rock types and environments, but in most cases transparent crystals are rare.

Andradite View Profile

Andradite is one of the rarest and most sought after garnets. There are no major sources of andradite and the supply is limited to small deposits.

Portuguese-Cut Anglesite - Morocco
Anglesite View Profile

Although anglesites with pale colors can show great dispersion and brightness, they’re difficult to cut and inadvisable to wear. Faceted pieces are true rarities, seldom seen except in very complete gem collections.

anhydrite - Iran
Anhydrite (Angelite) View Profile

Rare and difficult to cut, anhydrite is seldom faceted. However, this material can be carved into beautiful objects. “Angelite,” a blue-gray variety, has become a popular choice for cabochons.

Anorthite View Profile

Anorthite is the most calcic of the plagioclases, and sometimes makes up a distinctive rock known as anorthosite, which has been extensively studied.

neon blue-green apatite
Apatite View Profile

Although too brittle for most jewelry use, properly cut apatite gems are truly magnificent. A collector could assemble a suite of as many as twenty of these bright gems, all with different colors.

apophyllite gems - faceted
Apophyllite View Profile

Although not suitable for jewelry, apophyllite is a popular collector's piece. Perhaps the whitest of all gems, cut, colorless specimens are so devoid of color they can appear almost silvery.

custom aquamarine ring
Aquamarine View Profile

Named after the color of sea water, aquamarine is the blue to blue-green member of the beryl family. Readily available and moderately priced, the modern March birthstone makes an excellent jewelry stone.

aragonite - Czech Republic
Aragonite View Profile

Aragonite is more commonly found as a constituent of pearl and shell nacre than as a crystal suitable for gem cutting. Too soft for most jewelry use, a faceted aragonite would be a true collector's item.

triangle-cut augelite - California
Augelite View Profile

Soft and brittle, rare augelites are difficult to cut and unsuitable for wear. Faceted transparent pieces are only found in very complete gem and mineral collections.

3.60 cts axinite, oval cut - Pakistan
Axinite View Profile

When faceted, the members of the axinite mineral group are usually intensely trichroic, with considerable brilliance and rich brown and purple colors dominating. Although very rare, these gems could make magnificent jewelry stones.

Azurite and Malachite- Arizona
Azurite View Profile

Faceted azurite is a great rarity, but even small stones are extremely dark, virtually black. Azurmalachite is a mixture of azurite and another copper carbonate, malachite. Burnite is a mixture of azurite and cuprite (copper oxide). Azurite occurs in fine crystals in many localities, but in massive form is almost always mixed with malachite. In this form it is cut as very attrac...

Barite View Profile

Massive white barite (also called known as baryte) looks like marble and could be used for decorative purposes. In spite of the abundance of good crystals, cut barites aren't commonly seen, especially in rich colors.

Bayldonite View Profile

Bayldonite is a nondescript greenish material that has been cut into cabochons by enterprising collectors of the unusual. Cut bayldonites are a rarity, nonetheless, and are seldom seen in collections. The luster of cabochons is sometimes almost metallic and provides a curious appearance to the cut stones. Bayldonite provides a curious appearance to the cut stones. Bayldonite is comp...

benitoite trillion cut
Benitoite View Profile

With dispersion higher than diamond and sapphire blue body color, benitoite is one of the most attractive of all rare gems. Gem-quality crystals have been found only in San Benito County, California.

Beryl View Profile

The beryls are among the most popular, and also the most expensive, of all gems. A wide range of color is represented, from colorless to black. Beryls can be large and flawless, but these are best displayed in museums rather than worn. Emerald is acknowledged as one of the most desirable gemstones, and aquamarine has recently sustained an unprecedented rise in price. Morganite has s...

Beryllonite View Profile

Beryllonite is really not suited for wear, and since it is available only as small colorless stones, there is not much incentive to make jewelry out of it. However, Beryllonite is one of the truly rare collector gems and should be greatly prized as a cut stone. The cleavage makes gems hard to cut.

Bismutotantalite - Madagascar
Bismutotantalite View Profile

Extremely rare as a cut gem, even in very complete collections. Manu of the minerals in the tantalite group have been faceted; bismutotantalite is perhaps the rarest of them all. The color is attractive, but low hardness and good cleavage make use in jewelry unadvisable.

Black Onyx View Profile

Onyx is banded chalcedony that is found in many different colors, including commonly black and white.

bloodstone inlay ring
Bloodstone View Profile

Also known as heliotrope, bloodstone is the traditional March birthstone. This dark green, opaque chalcedony with red to orange spots is a variety of plasma gemstone.

Boleite View Profile

Cut boleite is strictly for collectors, since it is soft and very rare. Faceted gems of any transparency should be considered among the rarest of all gemstones. The color is so attractive that any available stones would be quickly snapped up by collectors.

square-cut boracite - Germany
Boracite View Profile

With light blue and green colors, no cleavage, and high hardness, boracite is an uncommon mineral. Unfortunately for jewelry lovers, faceted boracites are very rare.

Bornite View Profile

Bornite is suitable only for cabochons. The bronzy color rapidly tarnishes in air to a magnificent iridescent color display, mostly purple, but also with blue and green tones. Bornite is too soft and brittle for anything but a collector curiosity, although cabochons are quite attractive when they tarnish. The material is not rare, so cabochons have no great value beyond the effort o...

faceted brazilianite - Corrego Frio, Brazil
Brazilianite View Profile

Brazilianite's lovely green to yellow colors make it a must for gem collectors. Large faceted stones are often flawed, but smaller cut gems can make beautiful jewelry pieces.

Breithauptite View Profile

Breithauptite is a curiosity cut for collectors, although it could be worn with care in jewelry. The color is extremely lovely, a delicate reddish or violet with metallic luster that is both unique and attractive. Sometimes the reddish sulfide is veined with streaks of native silver or colorless gangue minerals, providing interesting patterning to the color. The material is not very...

brookite - rectangular step cut, Pakistan
Brookite View Profile

Brookite usually occurs in very dark colors, transparent only in small fragments. Cuttable crystals are exceedingly rare, making attractive faceted gems prized collector’s items.

step-cut brucite - South Africa
Brucite View Profile

Brucites are extremely difficult to cut. Although too soft for jewelry use, faceted pieces would be great additions to collections of rare gemstones.

Bustamite View Profile

Bustamite is very similar in appearance and properties to rhodonite. The Japanese crystals are very rich in Mn. The color, when fresh, is paler than rhodonite. Bustamite may also be fibrous, and then yields fine catseye gems, but these are extremely rare. Faceted Bustamite are very attractive, especially in the pinkish shades, but stones over 1-2 carats are very rare collector items...

Bytownite View Profile

Bytownite is found in basic plutonic rocks, some metamorphic rocks, and meteorites.

calcareous concretions - conch pearl pendant
Calcareous Concretions View Profile

Several species of marine mollusks produce stony growths called calcareous concretions. The most commonly encountered in jewelry are conch pearls from the Queen conch, tridacna pearls from the giant clam, and melo pearls from the bailer shell snail.

Calcite View Profile

Calcite is common and abundant throughout the world. The material has little intrinsic value since it is not scarce. However, calcite is one of the most difficult of all minerals to be cut because of perfect cleavage in 3 directions. The cost of faceted stone is therefore mostly in the labor of cutting. Normally, a faceted stone breaks during cutting, and the finished gem is much sm...

Canasite View Profile

The material usually seen on the market as “canasite” is purplish in color. It is frequently confused with another purplish material, a member of the  serpentine family known as stichtite. However, stichtite occurs in elongated fibers that have a kind of lustrous sheen, almost asbestiform, whereas canasite is granular. Recent research seems to indicate that, in fact, the mate...

Cancrinite View Profile

Cancrinite is one of the most attractive of all opaque or translucent gem materials. It is a bit too soft for average wear, but its distinctive color is worthy of jewelry. Cancrinite may be tricky to cut because it often contains numerous hard inclusions. Faceted gems even as small as 1 carat are considered great rarities.

Carnelian View Profile

The best-known and generally least expensive variety of chalcedony is carnelian. It ranges in color from yellow-orange to rich, near reddish orange, to orangey brown, and varies from semi-opaque to highly translucent.

brilliant-cut cassiterite - Bolivia
Cassiterite View Profile

Cassiterite is a durable gemstone with tremendous dispersive fire, especially visible in properly cut pale-colored stones. As the principal ore of tin, it’s also a common mineral. Unfortunately, facetable rough is very scarce.

Catapleiite View Profile

The only reported cut catapleiite is from Mte. Ste. Hilaire, Quebec, Canada, in the form of tiny colorless gems.

celestite - Madagascar faceted gem
Celestite View Profile

Soft, fragile, and hard to cut, celestite or celestine is seldom seen in collections. These gems are usually colorless or pale blue, but rare orange, green, yellow, and red shades have also been found.

ceruleite cabochon - Chile
Ceruleite View Profile

A little-known gem material of truly exquisite color, sky-blue ceruleite takes a very high polish easily and quickly. However, fine, solid, cuttable pieces are extremely rare.

Cerussite View Profile

Cut cerussite is as beautiful as diamond since has higher dispersion, is usually free of any body color, and has an adamantine luster. However, cerussite is extremely soft and one of the most brittle and heat sensitive of all minerals. Cutting a gem is a major chore, and cutting a very large one without breaking it is almost impossible.

chabazite - Nova Scotia
Chabazite View Profile

Although faceting chabazite isn't too difficult, it's too soft for jewelry. However, only a handful of cut chabazites may exist because facetable material is extremely scarce.

Chalcedony View Profile

Technically, chalcedony (kal SED' uh nee) is any form of microcrystalline or cryptocrystalline quartz, (meaning any form of quartz whose crystals are too small to be seen without high magnification.) In common practice, only the translucent, single color types are sold as "chalcedony" whereas the rest of this group are sold under individual variety names, or as jasper or agate. Whil...

Faceted Chambersite - Louisiana, 0.37 cts
Chambersite View Profile

Chambersite is an exceedingly rare mineral. Although it has properties suitable for jewelry use, its crystals occur in very small sizes. Few cut specimens of this colorless, brownish, or purple stone exist.

charoite - bowl and beads
Charoite View Profile

Named for the only locale in which it is found, the Charo River Valley in the former Soviet Union, Charoite is one of the few gems that is so distinctive in its color and patterns that a gemologist can feel justified in making a "sight" identification. There's really no other material likely to be mistaken for it -- at least this is true until a synthetic or man-made simulant comes ...

chicken-blood stone statue
Chicken-Blood Stone View Profile

One of the most prized ornamental materials in China, chicken-blood stone has been used for centuries to create carvings with characteristic red markings. However, its physical properties can vary considerably.

Childrenite View Profile

Cut childrenite is a great rarity, and all gems are small. Cut eosphorite is more abundantly available, though both materials are very scarce.

Chiolite View Profile

Chiolite makes a challenging gem. It's difficult to cut, extremely rare, and has little appeal. It's solely a curiosity in the gem world.

Chromite View Profile

Chromite is shiny and black, and makes a curious-looking cabochon with no special attraction. Occasionally, a cabochon has a reddish color. The stones have little value because the material is extremely abundant but are cut as curiosities only.

cat's eye chrysoberyl - Sri Lanka
Chrysoberyl View Profile

Although many gems show a cat’s eye effect, when the term “cat’s eye” is used alone, it always refers to the rare gemstone chrysoberyl. Chatoyant chrysoberyls can be cabbed to display their spectacular eyes, while non-chatoyant specimens can make wonderful faceted stones.

chrysocolla chalcedony - Arizona
Chrysocolla Chalcedony View Profile

Marketed as "Gem Silica" this relatively rare, blue to blue-green, opaque to near transparent material is the most expensive type of chalcedony.

chrysocolla specimens
Chrysocolla View Profile

Pure blue chrysocolla is extremely soft but interesting to gem collectors. On the other hand, chrysocolla that forms as gel mixed with silica and hardens into a blue to blue-green chrysocolla chalcedony is quite hard and a popular jewelry stone.

chrysoprase - carving
Chrysoprase View Profile

Chrysoprase is apple-green chalcedony that derives its color from nickel. Its hardness and striking color make it a popular gemstone for jewelry as well as carvings.

cinnabar - Nevada
Cinnabar View Profile

Magnificent red cinnabar is extremely soft and fragile, so faceted material is rare. It's cut primarily for collectors and carvings.

citrine - faceted stone
Citrine View Profile

Citrine is the yellow to red-orange variety of crystalline quartz. Clever marketing and the rise of “earth tone” fashions have made this durable and readily available gem a popular jewelry stone in recent years.

Grossular Clinochlore
Clinochlore View Profile

Clinochlore is a family of minerals in the chlorite group. To date, only kämmerite and sheridanite varieties are known to have been cut as gemstones.

Cobaltite View Profile

Cabochons are interesting because of the lovely reddish metallic appearance of this mineral. Cut stones are infrequently seen and are cut only as a curiosity by the collector who wants to have one of everything.

colemanite - round brilliant cut
Colemanite View Profile

Colemanite is an abundant mineral, and transparent material isn’t rare. However, gem cutters rarely facet these typically pale stones. Difficult to cut and wear, colemanites are better suited for collectors of unusual gemstones.

Fancy Elongated Hexagon Cut Color Change Garnet
Color Change Garnet View Profile

Color change garnets are mostly pyrope and spessartite in composition. Except for the color change, they are identical in properties to the Malaia variety. Their primary source is Africa.

Finished version of Emerald Cut Color Change Sapphire
Color Change Sapphire View Profile

Color change sapphires are those that change color between light sources.

Coral View Profile

Coral is the axial skeleton of an animal called the coral polyp, a tiny (1 mm), almost plantlike animal that lives in warm oceans (13-16°C). The solid material we know as coral is the colony in which these tiny animals live. Coral is often branched and treelike.

Cordierite View Profile

The crystal structure of cordierite has many similarities to that of beryl; indialite, the dimorph, in fact has the same structure as beryl. Iolite with hematite inclusions (bloodshot iolite) comes from Sri Lanka. The inclusions sometimes yield a gem showing a 4-rayed star (quite rare). The blue color of iolite along one optical direction strongly resembles sapphire, and such gems, ...

Corundum View Profile

Next to diamond, corundum is the hardest mineral known and is very compact and dense, with no cleavage. As a result, corundum is one of the best of all jewelry stones, especially star corundum, which is tough as well as scratch-resistant. Faceted gems are slightly brittle and can be chipped, though much less easily than other gems. Ruby is red corundum. All other colors of corundu...

covellite cabochon - Montana
Covellite View Profile

Although covellite has attractive blue colors and shows iridescence, this rare mineral is difficult to cut. You can scratch it with a fingernail! As cut gems, they're strictly curiosities for collectors.

faceted creedite - Chihuahua, Mexico
Creedite View Profile

Probably fewer than a dozen creedite gems have ever been faceted. This rare mineral is rarer still as a cuttable crystal. Too soft to wear, this strictly collector's gem occurs in attractive white, purple, and orange colors.

crocoite - faceted
Crocoite View Profile

Lovely saffron-colored crocoite is quite a rare mineral. Although too soft and brittle for jewelry wear, a few crystals have been faceted for collectors.

Cryolite View Profile

Cut cryolite is somewhat translucent, and has a "sleepy" look. The cuttable material has a very low birefringence, is colorless, and very soft—not exactly an exciting-looking gem. However, there are very few cut stones in existence because of the extreme scarcity of suitable rough. In addition, cryolite is only found abundantly at one locality (Ivigtut).

Cuprite View Profile

Cuprite is one of the rarest of all gems. For all practical purposes, cuttable material comes from only one locality. Only good crystals or pieces of crystals are cuttable, however, as other material from this mine is opaque. Mineral collectors do not wish to see their fine crystals cut, limiting the supply of available faceting material. Cut gems have a metallic appearance and magn...

cushion-cut danburite - Madagascar
Danburite View Profile

A very durable gemstone, danburite is an excellent choice for jewelry use. Although the mineral isn't rare, large facetable pieces are scarce.

light yellow datolite - Russia
Datolite View Profile

Datolite is a popular collector’s mineral. Polished sliced nodules can show off very attractive colors. Too soft for regular jewelry use, faceted and cabbed datolites are rare.

demantoid garnet - cushion cut, Madagascar
Demantoid Garnet View Profile

Demantoid is a green colored variety of andradite which is a variety of garnet group of minerals.

faceted diamond - South Africa - 69
Diamond View Profile

Diamond is the most romanticized and heavily marketed of all gemstones. Nearly every jewelry establishment handles diamonds, even if it has no other gemstones in stock. The annual world production of diamonds is on the order of 10 tons. Of course, only a small percentage of this is gem quality, but diamond of very fine quality is nowhere near as scarce as equivalently high quality r...

diaspore - Turkey
Diaspore View Profile

Diaspore is hard enough to make a durable jewelry stone, but the typical light brownish color is not easy to sell. Despite the large Turkish material, this is a very rare gemstone indeed.

Dickinsonite View Profile

This mineral is seldom even mentioned in the gem literature because it is so rare and has been so seldom cut. Faceted gems are practically nonexistent, and would be among the rarest of all cut stones.

faceted diopside gems
Diopside View Profile

Violane has been used for beads and inlay—transparent material is always very tiny. The color of this material is deep violet or blue and is very rare. Catseye material cuts extremely sharp eyes, the best being from Burma. Faceted diopside is not extremely rare, but large (over 15 carats) clean stones are. Colors are usually dark, so a bright and attractive gem is most desirable. ...

Dioptase View Profile

Dioptase is abundant in mineral collections throughout the world and is not considered a great rarity, but faceted gems are extremely rare due to a paucity of clean fragments. Clean stones over 1 carat are virtually nonexistent, and few collections have stones at all. Cabochons are blue-green, translucent, and quite attractive but are much too soft for wear.

dolomite - trillion cut
Dolomite View Profile

Although transparent dolomite crystals are fairly abundant and popular collector’s items, faceted gems are soft, fragile, and rarely seen in jewelry. However, massive material can be carved into decorative pieces.

dumortierite - Nevada and California
Dumortierite View Profile

Dumortierite is a beautiful and very hard material, eminently suitable for jewelry. The cabochon material is the only generally known form, since faceted stones are so rare. Fibrous inclusions have been noted in the transparent Brazilian stones.

Ekanite View Profile

Ekanite is metamict as a result of the U and Th content. The properties vary, depending on the degree of breakdown of the structure. Ekanite is one of the very rarest of all gems, and only a few are known. More undoubtedly exist that have been sold as other Sri Lankan gems, but the total number of gems is a mere handful.

Emerald View Profile

Since the time of Cleopatra, emeralds have epitomized the color of green gemstones. It would be easy to question this statement if all one had seen of emeralds were the commercial, (and poorer,) quality stones which abound on home shopping networks and in some jewelry stores.

Enstatite View Profile

Most gem enstatites have indices in the range 1.663-1.673. The brown and green gems from Tanzania are enstatites, as are the brownish-green stones from Sri Lanka. Green and brown gems from India and Brazil tend to be in the bronzite composition range. The gems of the orthopyroxene series are usually very dark, slightly brittle because of cleavage, and generally not appealing for jew...

eosphorite - shield cut
Eosphorite View Profile

Faceted eosphorites in pale colors are quite attractive and easy to cut. However, these very rare gems are too soft for most jewelry use.

epidote - Madagascar
Epidote View Profile

The epidote mineral supergroup contains many related species of interest to collectors. However, epidote itself is the one most likely to be faceted into beautiful, albeit small and dark, gemstones.

Ettringite View Profile

Ettringite is not generally facetable; any cut stone would be considered an extreme rarity. South African material has yielded minute stones, some of which may have been labeled sturmanite.

Euclase View Profile

Euclase is a hard enough gem to be worn safely in jewelry. It may not be terribly exciting to look at (if colorless), but the colored gems are truly beautiful and exceedingly rare over a few carats in size. These gems can be very brilliant. The cleavage makes cutting a bit tricky.

Eudialyte View Profile

Although cabochons could be cut from massive eudialite or translucent crystals, transparent material suitable for faceting is elusive and always small.

Euxenite View Profile

Euxenite is seldom seen in collections. Most collectors would not regard the mineral as facetable, but transparent fragments and areas of crystals have been noted that could cut small gems. Sometimes cabochons are cut by collectors, but these are not very striking. The colors of faceted stones would be too dark to make them appealing.

Polished Samples of Plagioclase
Feldspar View Profile

Feldspars are the most common minerals at the Earth's surface. In fact, if the entire composition of the Earth's crust were regarded as a single mineral, it would calculate out almost exactly as a feldspar.

Fergusonite View Profile

This mineral is not abundant and is known from various localities. Cabochons are cut merely as curiosities, as they have no special features that would recommend them except rarity. There are reports of transparent grains or parts of crystals that have been cut by collectors, but these are merely curiosities and are seldom encountered.

pink fluorite - Pakistan
Fluorite View Profile

Although too fragile for most jewelry use, fluorites are often faceted for collectors. They occur in a wide range of attractive colors and can be extremely bright. These gems are also renowned for their fluorescence.

Fossilized Organisms View Profile

Most people who have an interest in gemstones or nature have seen petrified wood, but fewer are aware of the many other types of fossilized organisms that can be fashioned into beautiful gems.

freshwater pearls - China
Freshwater Pearls View Profile

Pearls are unique among gemstones, being the only ones found within a living creature and the only ones that requires no fashioning, (cutting or polishing,) before use. Another distinctive feature is its near exclusive use by one gender. Although some efforts have been made to market pearl jewelry to males in recent years, pearls remain the most "feminine" of all gemstones. Designat...

friedelite - faceted
Friedelite View Profile

Friedelite is not abundant, and gem-quality material is rarely seen even in large collections. Faceted gems are true collector's items.

Gadolinite View Profile

This is not a terribly attractive gemstone, but faceted gems would be a tremendous rarity. The material is quite brittle, but there is no cleavage to cause problems in cutting. I do not know of the existence of a faceted gem at this writing.

blue spinel
Gahnospinel View Profile

Gahnospinel is a solid-state solution between spinel and gahnite.

Spessartite Garnet - Nigeria
Garnet View Profile

Garnet comes from the Latin word, “granatus” which means grain. That is because many garnet deposits are small grains of red crystals in or on their host rock.

Gaylussite View Profile

This mineral is very hard to cut because of extreme softness and cleavage. Gaylussite dries out slowly in air and the surfaces may turn white. Stones in collections are therefore best stored in sealed containers to prevent dehydration. Gaylussite is seen only in very comprehensive collections, and relatively few stones have been cut. Transparent crystals are not terribly rare, but f...

opalite jewelry - glass gemstones
Glass View Profile

Glass has been used in jewelry for thousands of years. By itself, glass is brittle and unimpressive with very little color or brilliance. However, with additives, it can become more colorful, lively, and durable.

grandidierite cabochon
Grandidierite View Profile

A rather rare mineral, lovely blue-green grandidierite is seldom seen in gem or jewelry collections. Translucent material is sometimes cut into cabochons. Faceted pieces are very rare, but recent discoveries of transparent material may bring more to the market.

merelani mint garnet - grossular garnet
Grossular Garnet View Profile

Grossular garnets come in almost every color, even colorless, except blue. However, unlike other garnets, they’re rarely red or dark. Often light to medium in tone, they make brilliant, vibrant jewelry stones.

Gypsum View Profile

Gypsum is one of the most abundant minerals and is found especially in evaporite environments. Alabaster, the massive, granular variety, has been used for thousands of years, made into vases, bowls, and other useful and decorative objects. Today it is used in ashtrays, clock housings, paperweights, and so forth.

hambergite - Madagascar 1.5 carats
Hambergite View Profile

Although hard enough for jewelry use, rare hambergite is a gem for collectors of the unusual. Its combination of high birefringence and very low specific gravity makes it easy to identify.

Haϋyne View Profile

Haϋyne is one of the major constituents of lapis lazuli, a well-known and ancient gem material. It is, however, rarely seen as a distinct gem species. It is cut for collectors mainly as a curiosity, but faceted gems that are deep blue in color are extremely beautiful. Blue is the most sought after color in this material.

Heliodor or Golden Beryl
Heliodor View Profile

An overview on Heliodor Jewelry and Gemstones.Covers details and essential information on the physical properties and characteristics of Heliodor gemstones.

hematite - Switzerland
Hematite View Profile

Hematite has a long history of use as a pigment. As a gemstone, this material is often carved but very rarely faceted. Despite its association with blood and the color red, hematite's color can range from black and metallic gray to brownish red in thin slivers or crystals.

hemimorphite cabochon - Arizona
Hemimorphite View Profile

Massive hemimorphite can have a very delicate, blue color. However, it's seldom cut because not very much has appeared on the market.

herderite - faceted
Herderite View Profile

Herderite is a rare collector's gem, especially in larger sizes. It's too soft for wear but attractive when cut and can show a wide range of colors.

hessonite garnet - cushion cut, Tanzania
Hessonite Garnet View Profile

Also known as the “cinnamon stone,” hessonite is the yellow-orange to reddish orange variety of grossular garnet. Hessonites can make beautiful, inexpensive jewelry stones.

Hodgkinsonite View Profile

Hodgkinsonite is one of the rarest of all collector gems. Cut stones are bright and richly colored, but the crystals were never abundant and still fewer had transparent areas. Fewer than 10 cut stones may exist.

Holtite View Profile

This mineral was first noted in 1937 but was not described in detail until 1971. It has not yet been seen as a gem, but the high hardness would allow it be worn with no risk of scratching. Holtite is now considered to be a variety of dumortierite. The mineral comes from the one locality, and a cut stone would have to be considered a great rarity.

Howlite View Profile

Howlite is always opaque in nodules; it is an abundant material and easy to acquire. Sometimes it contains black, threadlike impurities resembling the veining in turquoise. Howlite is frequently dyed blue to resemble turquoise, and it makes a most convincing simulant. The white material is relatively unexciting in appearance.

huebnerite - Peru
Huebnerite View Profile

It should not be difficult to find numerous small faceted huebnerites among larger gemstone collections. Certainly ample material exists to cut a number of such gems, although they are rarely offered for sale.

Humite View Profile

Faceted chondrodite is almost unknown, a pity since the color is very rich and the material is hard and durable enough for wear. Cutting presents no great difficulty, but rough is virtually unobtainable, and only tiny stones could be produced. The same is true for norbergite and humite. The exception seems to be clinohumite from the Pamir Mountains in the USSR. Crystals occur there ...

hureaulite - Brazil
Hureaulite View Profile

Hureaulite can show rich and lively pink, rose, and orange colors. However, this collector's gem is rarely cut.

hurlbutite - crystal pair - New Hampshire
Hurlbutite View Profile

Hurlbutite is an extremely rare mineral. Minute, colorless faceted stones have been cut from fragments.

Hydrogrossular View Profile

Hydrogrossular differs from the other garnets in that it is never transparent. It ranges from translucent to opaque. The most common color is a bluish green, but they are also found in pink, white, and gray.

Hyperitdiabas View Profile

Hyperitdiabas is one of the most outstanding minerals I have encountered in recent years. Its appearance striking beautiful and a close inspection reveals still more delights. It has all the properties of a commercially important gemstone, but its rarity will keep it on the sidelines.

Idocrase View Profile

Idocrase is one of the lesser known and more beautiful collector gems. When properly cut it is as bright and attractive as the grossular garnets, which it so strongly resembles. The complexities of its chemistry lead to a huge range in properties and colors. Cuttable material is known from Italy (brown and green), Quebec (pale green, bright yellow), New York (brown), Pakistan (gree...

Inderite View Profile

Inderite is very soft and difficult to cut, and only a few stones have been cut by hobbyists. There is plenty of cuttable material in existence, and although the material comes from only a few localities, it is not considered a great rarity. The surface of cut stones may become white and cloudy after cutting; care must be taken in storage and to dry the stones after cutting.

Iolite View Profile

This stone, which represents one of the few relatively available and affordable blue stone options, is rapidly gaining in popularity. Arguably the gain is due more to exposure in mail order catalogs and on cable shopping channels than to promotion by traditional jewelry stores. Run of the mill stones often have a steely, inky or washed out blue color, but the best specimens can riva...

jadeite, diamond, and white gold ring
Jadeite View Profile

One of two distinct minerals commonly known as jade, jadeite is the rarer and harder variety. Rich emerald-green jadeite, known as “imperial jade,” is also the most highly valued. However, durable jadeite can be found in many colors and is well-suited for both intricate carvings and cabochons.

Jasper - Oregon
Jasper View Profile

Jasper is an opaque, solid or patterned variety of cryptocrystalline quartz. All types of jasper take an excellent polish, are trouble free to care for, and hardy enough for all jewelry uses. These stones are usually cabbed, sometimes carved, but seldom faceted.

Jeremejevite View Profile

Until the Namibian material was found, jeremejevite was an exceedingly rare mineral available only in microscopic grains. The African crystals are amazing in being both large and gemmy. Few gems have been cut from the material since the crystals are prized by collectors and the extent of the find is unknown. The crystals are not abundant at the locality, so jeremejevite will remain ...

jet jewelry - gold cuff
Jet View Profile

Historically a popular black gem, jet has declined in popularity in modern times. Although jet jewelry has been long associated with mourning, this organic gem can be made into large, eye-catching beads, carvings, and even faceted pieces.

Kämmererite View Profile

Kämmererite is a beautiful but rare mineral. It is micaceous; consequently, it is extraordinarily difficult to facet, which has severely limited the availability of cut gems. It would have to be handled with great care to avoid cleaving. A few clean, well-cut gems do Perfect basal cleavage; micaceous; laminae exist, nonetheless, a testimony to the perseverance of hobbyists!

Kornerupine View Profile

Star kornerupine also has been found (Mogok, Myanmar) but is very rare. Kornerupine is generally dark brown or green and not very attractive due to the somber colors. The light green material from Kenya is much more appealing, but the sizes are always small (under 3 carats as a rule). The color is caused by traces of Fe, Cr. and V. Despite the fact that many stones are in museums ...

Kurnakovite View Profile

Kurnakovite is similar to inderite. Both are colorless and very uninteresting as faceted gems, which is why very few have been cut. The material is obtainable in large size, but softness and cleavage make cutting a real chore.

Kyanite View Profile

Kyanite is very rare as a faceted gem, especially if free from inclusions and flaws. The material is extremely difficult to cut because of its perfect cleavage and the extreme variability in hardness in different directions in the same crystal. A few catseye kyanites are known to exist.

Labradorite View Profile

An overview on Labradorite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Labradorite.

langbeinite - New Mexico
Langbeinite View Profile

This material is nondescript and is cut solely as a curiosity. The gems are soft, pale colored, or colorless, with no fire. Few cut stones have been reported, but this may be due to a lack of interest rather than a lack of suitable rough.

Lapis Lazuli View Profile

The gem known as lapis lazuli, or simply lapis, is actually a rock, composed of lazurite, hauyne. sodalite, and nosean, all members of the sodalite group of minerals. Lazurite itself may be considered a sulfurrich hauyne. Calcite and pyrite in various percentages are also present in the rock. The finest lapis is considered to be a solid, deep blue with no white calcite spots and jus...

Laserblue synthetic glass
Laserblue View Profile

Laserblue is a rare, synthetic glass. It's hard for glass but easy to chip.

Lawsonite View Profile

Lawsonite is extremely rare as a faceted stone, seldom reported and generally unavailable.

lazulite - cabochons
Lazulite View Profile

Lazulite makes a magnificent, deep blue gemstone. Although the mineral itself occurs widely, gem-quality rough is limited. Specimens are prized by collectors but can also be faceted with care or cut into cabochons for jewelry.

0.68-ct rectangular step-cut legrandite
Legrandite View Profile

Too soft for jewelry use, legrandite is a popular collector’s mineral because of its intense yellow color and aesthetic crystal groupings. Transparent, faceted gems are extremely rare.

Lepidolite View Profile

Reddish granular or massive lepidolite is usually slabbed for ornamental purposes, such as ashtrays paperweights, and bookends. Faceted micas are virtually nonexistent because of the perfection of the cleavage and the variable hardness within crystals.

Pear-cut leucite - Italy
Leucite View Profile

Although abundant in various lava rocks, leucite is extremely rare in gem-quality form and often has a milky or cloudy look. Faceted stones as well as well-shaped crystals are prized by collectors.

Linarite View Profile

The blue color of linarite is magnificent, and it is a pity that large facetable rough has not been found. Clean areas of crystals are usually very small, and breakage in cutting due to the softness and cleavage of the mineral further complicates the salvaging of a large gem. This is a lovely collector item and an extremely rare one.

Ludlamite View Profile

Ludlamite has a lovely green color but is too soft for wear. Large crystals are known from only a few localities, and cut stones are extremely rare.

Magnesite - Brazil
Magnesite View Profile

Gems of completely transparent magnesite are both rare and beautiful. The huge birefringence is obvious even in small stones, and larger gems have a sleepy look, or fuzziness, due to the doubling of back facets as seen through the table. Faceted magnesite is rarely seen, and the material is relatively difficult to cut. Facetable crystals come only from Brazil.

Malachite View Profile

Malachite is one of the most popular and beautiful of decorative stones. lts rich, patterned coloration in shades of green is unique among gems. Malachite can (with great care) be turned on a lathe to make goblets and candlesticks. It is extensively used to make cabochons, beads, boxes, and carvings of all kinds. Fibrous aggregates are packed masses of crystals, and these also take ...

Malaia Garnet - 3.10 cts
Malaya or Malaia Garnet View Profile

Malaia garnet is a variety of garnet that is typically light to dark slightly pinkish orange, reddish orange, or yellowish orange in color.

Mali Garnet - Kayes, Mali
Mali Garnet View Profile

Mali Garnet, one of the rarer varieties within the garnet group, is a mixture of the species grossular and andradite, (therefore it is sometimes called "grandite.") The entire garnet group is a solid solution series of silicates. That means the crystal structure is basically the same throughout the group, but some of the chemical formulas differ. At certain key points throughout the...

Mandarin garnet - orange spessarite garnet
Mandarin Garnet View Profile

While the colors of spessartite garnet gemstones cover a wide range of orange shades, the mandarin garnet is as pure orange as this variety can be.

Manganotantalite View Profile

Manganotantalite makes a spectacular red brown gem that is a very rare collector’s item. Transparent material is light enough in color to allow lots of light to enter and leave a cut gem, and properly cut stones are lively and brilliant. Cutting is difficult because of the cleavage.

marcasite - Canada
Marcasite View Profile

Marcasite has a long history of use as a decorative and jewelry material. However, this brassy colored, metallic stone is quite brittle and seldom seen in modern jewelry.

Meliphanite View Profile

Meliphanite is an extremely rare gemstone, and perhaps fewer than 5-10 faceted stones have ever been cut.

faceted mellite - Hungary
Mellite View Profile

Mellite is a rare and unusual organic gemstone. Although soft and fragile, the “honey stone” is quite beautiful when cut.

A cluster of microcline twinned crystals
Microcline View Profile

Microcline is a variety of feldspar. The only microcline you are likely to encounter is amazonite.

microlite - faceted
Microlite View Profile

Ranging in color from pale yellow to brown, reddish, and green, microlite cabochons are prized by collectors. Faceted gems are very beautiful but extremely rare.

Milarite View Profile

Milarite was originally known as a green mineral, until fine yellow crystals were discovered in Mexico in 1968. Larger Mexican crystals have transparent areas and have been faceted into small gems of pleasant appearance but great rarity.

millerite - filiform crystals
Millerite View Profile

Millerite has a rich, attractive yellow color. Massive millerites can sometimes be cut into cabochons but are too soft for jewelry use. However, millerite crystals can also have a striking, hair-like appearance.

Mimetite View Profile

Faceted mimetite is one of the rarest of all gems since only one pocket of transparent crystals has ever been found (at Tsumeb), and few of these crystals have been cut. Orange and yellow cabochons are richly colored but are too soft for wear.

Moldavite View Profile

Moldavite is a transparent to translucent olive to bottle green tektite, first found in 1787 at the Moldau River in Czechoslovakia. In general, tektites are natural glasses which are thought to have been created by melting of silica sand or rock by meteoric impact. A popular idea is that the melted material then was flung into the air and cooled into glass as it landed over the area...

Monazite View Profile

Monazite may be partially metamict, with N=1.79. Stones can be an attractive yellow or brown color but are usually small.

Moonstone - India
Moonstone View Profile

Moonstone or "Adularia", an orthoclase feldspar, was originally named for an early mining site at Mt. Adular in Switzerland. From this tradition we derive the term "adularescence" which is the optical phenomenon of iridescence which creates a billowy, floating blue to white light in this gem. Adularescence is due to diffraction of light as it hits thin, alternating layers of orthocl...

Mordenite View Profile

Compact, fibrous material is cabbed because the fibers provide a chatoyancy that sometimes yields weak catseyes. Coloration in the material is due to staining. This is a relatively unexciting mineral, and gems are equally uninspiring. Nevertheless, it has been reported as being cut for collectors.

morganite - triangular cushion cut
Morganite View Profile

A member of the beryl family, morganite shows a range of pink colors due to traces of manganese. Recently, this gemstone has seen an increase in popularity and value. Like most beryls, morganite makes an excellent jewelry stone.

Nambulite View Profile

The color of Namibian nambulite is a striking orange-red, very intense, and not really like any other gem I have seen. Cut stones would be both extremely rare and quite magnificent, perhaps bearing some similarities to rhodonite.

Natrolite, Mesolite, Scolecite View Profile

All three minerals are fibrous or elongated zeolite minerals. Faceted gems are almost always elongated emerald cuts or step-cuts.

indochinite tektite
Natural Glass View Profile

Glass comes in several natural forms. All are used in jewelry.

Nepheline View Profile

A variety called elaeolite is red, green, brown, or gray, massive or in crystals filled with minute inclusions. These inclusions produce a sheen that yields a catseye effect in cabochons. Facetable nepheline is a great rarity, and very few gems have been cut, always in the 1-2 carat range or smaller.

nephrite dagger hilt - India
Nephrite Jade View Profile

Nephrite is one of the two distinct minerals commonly known as jade. While nephrite doesn't match the variety or the fine green colors found in jadeite, it's even more durable as a gem material for jewelry and carved objects.

Neptunite View Profile

An overview on Neptunite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Neptunite gems.

niccolite - rough and cabochon
Niccolite (Nickeline) View Profile

Niccolite’s delicate peachy red color and metallic luster looks beautiful when polished. Gem cutters typically carve this gem material into cabochons for jewelry use.

Obsidian View Profile

Obsidian is an attractive material and displays a wide variety of appearances. Snowflake obsidian, with spherulites of cristobalite, is widely used in jewelry as beads and cabochons. Apache tears, which are cores of unaltered glass in nodular shells of decomposed obsidian, are popular among beginning hobbyists. Some of these have been faceted. Green, blue, and reddish (transparent...

Oligoclase View Profile

Oligoclase gems are feldspars that are part of a solid state series between albite and anothrite.

Ethiopian opal, faceted by Mark Kaufman - opal gems
Opal View Profile

Opals are in a class by themselves. As a species, opal is so unique it has its own descriptive vocabulary. More than any other gem, each opal is distinctly individual. Opals are also the most delicate gemstones commonly worn and require special care.

Oregon sunstone pendant
Oregon Sunstone View Profile

What a nice coincidence that Lapidary Journal's cover story for January, 1998 is on Oregon Sunstone! The article points out that prior to the finds of substantial amounts of facetable crystals in Oregon, most sunstone, much of which came from the Orient, was used for cabbing material, or in the production of pale yellow, low value, faceted goods. Such is the case no more. An incredi...

Rough orthoclase
Orthoclase View Profile

Orthoclase is best known for moonstone. It is occasionally a transparent, faceted gem. Note that moonstone is occasionally a labradorite.

Padparadscha Sapphire
Padparadscha Sapphire View Profile

Padparadscha is a light to medium toned pink-orange to orange-pink hue sapphire.

cushion-cut painite - Myanmar
Painite View Profile

Until 2001, only three painite crystals were known to exist. Since then, additional discoveries have produced many more specimens of this deep red gemstone, but facetable material remains very rare.

Palygorskite - Virginia
Palygorskite View Profile

Although marketed as “angel skin opal,” “rock wood,” and “mountain leather,” palygorskite is neither opal, wood, nor leather. This unusual, parchment-like mineral can be cut into cabochons or carved.

papagoite cabochon - Arizona
Papagoite View Profile

Cerulean blue papagoite crystals are too small for faceting. However, massive material mixed with quartz can be cabbed, while quartz crystals with papagoite inclusions make striking specimens for collectors.

Paraíba Tourmaline View Profile

Paraíba is an elbaite tourmaline that is colored by copper.

Pargasite View Profile

The amphibole group is very large and extremely complex and contains numerous distinct species that vary subtly in chemistry and physical properties. Pargasite and ferropargasite are calcic amphiboles that generally are lumped together as hornblende,even though up to 16 distinct minerals belong to this group, including actinolite. The identity of a specific amphibole is determined ...

Parisite View Profile

An overview on Parisite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Parisite gemstones

saltwater pearl, ruby, and diamond ring
Pearl View Profile

Pearls are the only gems found within living creatures, both salt and freshwater mollusks. However, most pearls on the market today are cultivated, since they now occur extremely rarely in nature. While they require special care, pearls have an enduring appeal for jewelry, particularly as the traditional June birthstone.

Larimar cabochon set
Pectolite (Larimar) View Profile

Fibrous pectolite has long been a curiosity for gem collectors. Compact material can make wonderful cabochons, and transparent crystals are rare and usually tiny. Larimar, blue pectolite from the Dominican Republic, has become a popular jewelry stone.

Pentlandite View Profile

Pentlandite resembles other yellowish metallic minerals and is cut by collectors as a curiosity. The cut stones are quite attractive but too soft for hard wear.

Periclase - synthetic
Periclase View Profile

Periclase has been synthesized in large masses in the laboratory, but these have no market significance. A faceted natural periclase would be a great rarity due to the extreme scarcity of suitable faceting rough. The expected size would be less than 1 carat.

peridot - Mogok, Myanmar
Peridot View Profile

Peridots have been prized as jewelry stones since ancient times. Always green in color but with considerable variations, their particular shades depend on their locality of origin.

Peristerite View Profile

Peristerite is primarily oligoclase with a complex mixture of feldspars. It has iridescence that is either blue or white.

Perthite View Profile

Perthite is a blend of microcline, albite and oligoclase. It is usually brown and white. May have gold or white iridescence.  

petalite - Afghanistan
Petalite View Profile

Gem-quality, colorless, facetable petalite is rare and desirable to collectors. More so if the stones are large and free of inclusions.

faceted phenakite - Russia
Phenakite View Profile

Rare phenakite is a very hard gem material suitable for jewelry. Usually colorless, cut stones have little fire but can be very bright.

large phosgenite - rectangle brilliant cut
Phosgenite View Profile

Rare phosgenite typically shows pale colors. This material is difficult to cut and too soft for jewelry wear. However, its strong yellowish fluorescence appeals to collectors of unusual gemstones.

Faceted phosphophyllite, 10.22 cts - Bolivia
Phosphophyllite View Profile

Renowned for its delicate blue-green shades, phosphophyllite’s beauty is enhanced by expert cutting. Unfortunately, this gem is quite fragile and difficult to cut, and few large facetable crystals exist. This makes phosphophyllite one of the more desirable — and expensive — collector’s gemstones.

pollucite - rough and faceted, Maine
Pollucite View Profile

Colorless pollucites lack fire when cut and are usually small. However, this very rare cesium mineral is a coveted collector's gem.

Powellite View Profile

An overview on Powellite Jewelry and Gems. Covers details and essential information on the physical properties and characteristics of Powellite gemstones.

Prehnite View Profile

Prehnite is popular as a cabochon material among hobbyists because of its lovely green and blue-green to yellow colors. Completely transparent material is extremely rare but might be found in crystals from Asbestos, Quebec. Yellowish to greenish translucent material from Australia has been faceted and makes a striking cut gemstone with a rich color and interesting appearance, with a...

Prosopite View Profile

An overview on Prosopite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Prosopite gems.

proteus garnet
Proteus View Profile

A few almandine/pyrope garnets from the US will change with treatment into proteus garnets. In reflected light, they have a dark gray, metallic luster. In transmitted light, the dark red of the garnet shows through.

faceted proustite - 2.58 cts
Proustite View Profile

Proustite crystals have magnificent red colors and good brilliance. Although facetable, they're too soft for jewelry use but highly desired as collector's gems.

Pumpellyite View Profile

The gem variety of pumpellyite, chlorastrolite, is best known from the Lake Superior district of the United States. It typically forms aggregates of packed fibers that are mixed with other minerals, resulting in a green and white pattern reminiscent of tortoise shell. The effect is best observed when the fibers are in radial clusters that yield circular markings. 

Purpurite View Profile

This material is never transparent and is too soft for wear. However, cabochons are a magnificent purplish rose hues that have essentially no counterpart in the gem world. The material is available from Namibia in abundance and at low cost.

Pyrargyrite View Profile

Pyrargyrite is found in a number of localities in well-formed crystals, but these are usually small. However, larger, transparent crystals from Bolivia and Chile have provided a limited amount of cuttable rough. Stones approaching 50 carats have been cut, but these tend to be too dark to be really attractive. They are exceedingly rare, however, since pyrargyrite is seldom transparen...

Pyrite View Profile

Pyrite is more commonly known as fool’s gold and is familiar to nearly every mineral collector. It has been used for centuries both in jewelry and as an ore of iron. “Marcasite” stones in jewelry are frequently pyrite, since the latter is more stable. The material is very brittle and heat sensitive and requires some care in cutting. Cabochons are sometimes cut, but they have...

pyrope garnet
Pyrope View Profile

Pyrope comes from a Greek word meaning “fire like.” The common dark red garnets are a mixture of pyrope and almandine.

Pyrophyllite View Profile

Pyrophyllite resembles talc in many ways and is indistinguishable by eye from soapstone. Chemical tests are needed to distinguish them. North Carolina material is often used in carvings, as is the material from China known as agalmatolite.

freeform step-cut pyroxmangite - Brazil
Pyroxmangite View Profile

Pyroxmangite grains are rare, seldom clean enough to facet, and difficult to cut. However, when cut, they are extremely beautiful and rich in color.

Pyrrohotite View Profile

An overview on Pyrrhotite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Pyrrhotite gems.

Quartz, Tibet
Quartz View Profile

An overview on Quartz Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of a Quartz mineral.

Quartzite View Profile

Quartzite is a rock made up of tightly packed quartz grains. Sometimes, it contains small crystals that reflect light. This material is called aventurine.

realgar - wheel of light pendant
Realgar View Profile

Although this common arsenic sulfide mineral occurs worldwide, cut gem-quality realgar is extremely rare. This fine, red stone is very fragile, difficult to cut, and nearly impossible to wear.

reb beryl - faceted
Red Beryl View Profile

Originally known as bixbite, red beryl is one of the rarest, most desirable, and most expensive gemstones. Most fine crystal specimens are zealously guarded by mineral collectors and are never faceted.

rhodizite copper ring
Rhodizite View Profile

Rhodizite is tough enough to make an excellent jewelry stone. However, it's quite a rare mineral. Faceted specimens are extremely rare and usually small and pale in color.

faceted rhodochrosite - South Africa
Rhodochrosite View Profile

Beautiful rose red to pink rhodochrosite crystals are popular with mineral collectors. Although very soft, opaque material has been fashioned into beads, cabochons, and carvings, while very rare translucent to transparent material has been cut into faceted gems.

Fancy Brilliant Octagon Cut Rhodolite Garnet
Rhodolite View Profile

Rhodolite is a garnet, intermediate in composition between almandine and pyrope. Its distinctiveness lies in its color, which is nearly always a purplish red.

faceted rhodonite - Brazil
Rhodonite View Profile

Ranging in color from pink to a fine rose red, rhodonite is a popular material for jewelry and decorative objects. Faceted rhodonite has an intense, beautiful color, but this material has a reputation as one of the most difficult gemstones to cut.

Rose Quartz
Rose Quartz View Profile

Rose quartz receives its coloring from titanium. It's always a light to medium pink, but sometimes picks up a violet shade. It's commonly carved into spheres or cabbed into a star stone.

rubellite - Russia
Rubellite Tourmaline View Profile

Rubellites are tourmalines with reasonably saturated dark pink to red colors and medium to dark tones. They make excellent jewelry stones, and ruby-red colored specimens without orange or brown overtones are highly prized.

Burmese and Thai Rubies
Ruby View Profile

Ruby is red corundum, all other color varieties of corundum being referred to as sapphire. The name "Ruby" is from Latin - ruber - and is based on the gem's red color.  That fact notwithstanding, the ruby color range includes pinkish, purplish, orangey, and brownish red depending on the chromium and iron content of the stone. The trace mineral content tends to vary with the geol...

cushion-cut rutile - Pakistan
Rutile View Profile

Though perhaps best known as inclusions within other gems, rutile crystals themselves can be faceted or cabbed as curiosities for collectors. Synthetics can show a variety of colors and have even been used as diamond simulants.

Saltwater Pearls - Ring
Saltwater Pearls View Profile

Pearls are one of our most ancient gems with records of commercial harvesting going back 2500 years. Their natural occurrence is very rare, with only one in several million shellfish ever producing a pearl. Oysters are the best-known source, but clams, mussels, and abalone also produce pearls.

samarskite - Norway
Samarskite View Profile

Samarskite is a very heavy material from which lustrous black to brownish cabochons are sometimes cut as curiosities. The material is rather brittle and is not intended for wear. It is rarely seen or displayed since black stones are not terribly attractive. Sometimes a stone is faceted in the nature of jet or marcasite.

Sanidine View Profile

Sanidine is a mineral of volcanic rocks, rarely considered a gem. While occasionally brown or yellow, most examples are colorless.

Sapphire Rough
Sapphire View Profile

Few gems have held our attention over millennia as well as sapphire. The pure blue colors and excellent durability of this gem-quality member of the corundum family make for an exceptional gemstone. However, not all sapphires are blue. They come in every color of the rainbow. Except red.

sapphirine, silver, and enamel brooch
Sapphirine View Profile

Sapphirines are durable but very rare gemstones. Although named after their typically sapphire-blue color, these gems can occur in different hues and display pleochroism, too.

faceted sarcolite - Italy
Sarcolite View Profile

Sarcolite is an extremely rare mineral. Tiny, colorless to “fleshy pink” gems have been cut only from material from one locality: Mount Vesuvius.

faceted yellow scapolite -emerald cut
Scapolite View Profile

Although not well known, scapolite would make an attractive gem material for both jewelry enthusiasts and mineral collectors. It comes in a wide variety of colors and can show dramatic fluorescence and phenomenal effects.

oval-cut scheelite - China
Scheelite View Profile

Large, faceted scheelites are among the most beautiful of all collector’s gemstones. They occur in many colors and fluoresce very brightly. If cut properly, scheelites can have tremendous fire.

faceted scorodite - Namibia
Scorodite View Profile

With lovely colors and intense pleochroism, faceted scorodite is a prize for collectors of the rare and unusual. However, it’s too soft for jewelry use.

Sellaite View Profile

An overview on Sellaite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Sellaite gems.

Senarmontite View Profile

Senarmontite is a rare mineral, restricted in occurrence to the presence of antimony sulfide ores. It is much too soft to wear, and the colors are usually nondescript. However, a faceted senarmontite in any size would be a great rarity.

Serandite View Profile

This essentially is another one locality mineral, where very small gems have been cut from an occasional crystal fragment that is not always even transparent.

Serpentine View Profile

Bowenite is usually blue-green, yellow-green, or dark green and translucent; it is used for carving, knife handles, and so forth, and in jewelry. Williamsite contains dark octahedral crystals of chromite, and patches of white brucite (magnesium hydroxide).Ricolite is a banded serpentine from Rico, New Mexico. Satelile is a serpentine pseudomorph after asbestiform tremolite from...

Shattuckite View Profile

Shattuckite is often mixed with quartz, and data often reported for properties may be erroneous. The cabochons are rich blue in color and very popular, but the material is not abundant and seldom seen on the market.

Shell, Sea Shells View Profile

Sea shells are one of our most ancient decorations. Our prehistoric ancestors used to string them into necklaces or hang them from cords as pendants. People still use them this way today.

Shortite View Profile

Shortite is an exceedingly rare, not overly attractive mineral. Cut gems are among the rarest of all faceted stones. The material is a carbonate and is therefore fragile and soft.

Brazilian siderite - faceted
Siderite View Profile

Siderite is difficult to cut, but this light brown collector's gem has yielded faceted pieces of great beauty.

Sillimanite View Profile

The fibrolite from Burma and Sri Lanka is well known to gem collectors, and highly prized because of its great scarcity. Blue and greenish gems are lovely, although very difficult to cut. Chatoyant material sometimes yields catseye fibrolites, which are also very rare. The material from Kenya is just as attractive as Burmese fibrolite but seems to be somewhat smaller in size.

Simpsonite View Profile

Simpsonite is an extremely rare gemstone. The material from Western Australia is bright yellow-orange and very beautiful. The mineral is hard and durable, with no cleavage, and could easily become a popular gemstone if it were more abundant. Gems over 1 carat should be considered extremely rare because clean material is a very small percentage of the limited supply of simpsonite tha...

Sinhalite View Profile

Long thought to be brown peridot, sinhalite was investigated in 1952 and found to be a new mineral. When cut, it is richly colored, bright, and attractive, and resembles citrine, peridot, or zircon. Large gems are very rare, but smaller stones are available in the marketplace. Some people have reported that it was easier at times to find a large sinhalite for sale than a small one, ...

Smaltite View Profile

Smaltite is a collectors oddity, cut only as cabochons. It is seldom seen in collections since it is not especially distinctive, with a color resembling other metallic sulfides and arsenides.

bi-color smithsonite cab - Mexico
Smithsonite View Profile

Smithsonite occurs across the globe, but facetable crystals are extremely rare. These gems can show a wide range range of rich colors but are too soft for most jewelry use. However, high dispersion makes properly faceted smithsonites truly magnificent collector’s pieces.

Smokey Quartz
Smoky Quartz View Profile

Smoky quartz comes in every shade of brown, from a light tan to nearly black. This gem is known for its large sizes. If you want a really big gem on a very small budget, this could be your stone.

sodalite carving
Sodalite View Profile

Tough, easy to cut or carve, and rich in color, typically blue, sodalite is highly desired by hobbyists. Even stones that lack transparency make lovely faceted gems.

Sogdianite View Profile

Sogdianite is an extremely rare mineral, suitable for cabochons. The color is striking and the material is hard enough to take a good polish. It is usually mixed with other minerals, so the SG and hardness are variable. Chemical analysis may be required to differentiate sogdianite from sugilite, but the latter is far more abundant.

Fancy Brilliant Emerald Cut Spessartite Garnet
Spessartite Garnet View Profile

Spessartite is somewhat rare. As with the other garnets, it always occurs in a blend with other species. Gems with the highest spessartite content are a light orange. Those with an almandine content are reddish, to red brown in hue.

Star of Asturias - sphalerite
Sphalerite View Profile

Sphalerite occurs in many colors. With a dispersion over three times that of diamond and an adamantine luster, faceted specimens make beautiful additions to gem collections. However, they're too soft for most jewelry uses.

Sphene - Emerald Cut - Madagascar
Sphene (Titanite) View Profile

Sphene, also known as titanite, has rich body colors, strong trichroism, and a fire that exceeds diamond. Although softer than many more popular gems, sphenes can make wonderful jewelry stones if set and maintained properly.

Spinel Gemstones - Sri Lanka
Spinel View Profile

Spinel is an important gem historically because it has been confused with other gemstones, especially ruby. Large red gems such as the Black Princes Ruby and the Timur Ruby in the Crown Jewels of England have proven to be fine large red spinels (ruby spinel). In ancient times this material was known as Balas ruby.

bicolor spodumene
Spodumene View Profile

Extraordinarily difficult to cut, spodumene has several colorful varieties, such as hiddenite and kunzite, highly coveted for jewelry.

Spurrite View Profile

This attractive but rather rare mineral has seldom been cut as a gemstone. Polished slabs and rough material appeared in 1986 at a mineral show in substantial quantities, however. This material is Mexican, translucent to opaque, and medium to dark purple in color.

Star Sapphire
Star Sapphire View Profile

Star sapphire is a type of sapphire that displays asterism, a star-like optical effect.

reddish brown staurolite - oval cut, Brazil
Staurolite View Profile

Staurolite crystals in opaque cross shapes are popular gemstones. However, this material is very rarely transparent or facetable. These dark colored gems would make very durable jewelry pieces.

faceted stibiotantalite - Mozambique
Stibiotantalite View Profile

Rare stibiotantalite possesses an interesting mix of physical and optical properties that help distinguish it from other earth-toned gemstones. However, cut pieces over 2-3 carats rank among the rarest collector’s gems.

Stichtite View Profile

Stichtite is not facetable, but the pink color is quite striking in cabochons. Cut stones are especially beautiful when there are other minerals present to add splashes of green and yellow. This material somewhat resembles a pink, granular material from the USSR referred to as canasite.

Stolzite View Profile

Stolzite is a rare mineral; much rarer than wulfenite and usually occurs in very minute crystals. However, the Australian crystals may be up to 1 inch...

Strontianite View Profile

Strontianite is a collector’s oddity, with no spectacular properties to recommend it. Colors are usually pale and there is little fire; in addition, the high birefringence doubles back facets and kills the brilliance of the stone. Cut strontianites are, however, decidedly uncommon and worth pursuing for their scarcity value.

Sugilite View Profile

What is the color of sugilite? Grape jelly purple is a good description. The gemstone isn't very popular among consumers in North America. (Most sugilite sales are in Asia). Nevertheless, this is a very rare and beautiful gem, if opaque and unusually colored.

faceted sulfur - Michigan
Sulfur View Profile

Although sulfur is very abundant, facetable material is not. Sulfur is also enormously difficult to cut and almost impossible to wear, so faceted pieces have some scarcity value for collectors of unusual gems.

Oligoclase Sunstone from ndia
Sunstone View Profile

Sunstones contain hematite or goethite inclusions, which reflect light in parallel orientation and create a sparkling sheen in gold to brown color shades. These gems may be oligoclase or labradorite in composition and are much admired as a cabochon material among hobbyists.

Taafeite View Profile

Taaffeite reacts to most gemological tests like mauve-colored spinel, but can be distinguished on the basis of its birefringence. Additional stones will undoubtedly be discovered in the future (generally misidentified as spinel) as collectors search for these rarities. Taaffeite is one of the rarest of mineral species, and surely among the very rarest and most desirable of all colle...

Talc View Profile

An overview on Talc Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Talc gemstones.

Tantalite View Profile

Tantalite is too dark to be of use as a faceted gem but is sometimes cut as a collector curiosity, either faceted or in cabochons. These could be of any desired size.

tanzanite - gold Celtic ring
Tanzanite (Zoisite) View Profile

Tanzanite has had a rapid rise to prominence among jewelers and gem enthusiasts. Although naturally reddish brown, this transparent zoisite variety achieves a stable, beautiful blue to violet color wth heat treatments.

Tektite View Profile

Tektites were first discovered in 1787 in Czechoslovakia (then Moravia) near the River Moldau, hence the name moldavite. It has been argued that tektites originated as a result of violent explosive activity on the Moon and were thrown all the way to the Earth's surface. Other scientists, currently in the majority, argue that tektites are of terrestrial origin. The issue is being d...

Tephroite View Profile

Tephroite is generally reddish brown and barely translucent. However, it takes a good polish and is massive enough to make good cabochons. Only the New Jersey and Australian localities seem to have provided such material, however. Faceted gems are unknown.

thaumasite, rectangular step cut - South Africa
Thaumasite View Profile

For a long time, rare thaumasite crystals — pale, fragile, and with little to no fire — were interesting primarily as mineral specimens. With the discovery of even rarer facetable material, cut thaumasites are now prized collector’s gems.

Thomsonite View Profile

Thomsonite cabochons take a high polish but are somewhat brittle. These are especially lovely when a pinkish gray eyelike pattern is present, but such material is rare, Lintonite, from Michigan, is translucent and green and is sometimes mistaken for jade. A faceted thomsonite must be considered a great rarity.

tiger's eye - South Africa
Tiger's Eye View Profile

Crocidolite, (blue asbestos,) alters to quartz, but while retaining its fibrous structure. This material is frequently stained by iron, giving it a golden brown color. We know this material as tigers eye. Unstained pieces, retaining their original blue color, are called Hawks Eye. There are also pieces with both colors.

Topaz View Profile

Topaz of any type is a good jewelry stone and it is historically one of the most important gemstones. With its relatively high refractive index and hardness of 8, with no special sensitivity to chemicals it can be used, with appropriate care, in any jewelry application. Although perfect cleavage does present a caution, this is mostly solved in the cutting stage --cutters generally o...

Tri-Color Tourmaline from Nigeria by Daniel Stair of customgemstones.com
Tourmaline View Profile

Tourmaline is one of our most popular gems. No other mineral comes in more colors and some of the combinations are in a class by themselves.

Tremolite View Profile

It is possible to misidentify tremolite, mistaking it for other amphiboles. Hexagonite is the rarest of the gem varieties of tremolite. If tremolite occurs in very tiny fibrous crystals, densely matted and interlocked, it is then known as nephrite (jade). Material containing more or less parallel fibers is somewhat chatoyant and yields weak catseyes. These are sometimes called ca...

triphylite - triangular step cut
Triphylite (Tryphylite) View Profile

Triphylite is one of the world's rarest gems. The IGS had the extraordinary privilege of examining a discovery of facetable material from Brazil that showed previously unknown characteristics.

Tsavorite Garnet View Profile

An emerald-green colored variety of grossular garnet, tsavorite is one of the most popular and expensive varieties of garnet. This gemstone can be faceted into many designs and can be used in rings, pendants, necklaces, and earrings.

tugtupite - inlay
Tugtupite View Profile

Gem collectors prize tugtupite for its rich colors and intense reaction to ultraviolet light. Sporadically used in jewelry, clean, faceted tugtupites are great rarities.

Turquoise display
Turquoise View Profile

This striking sky blue to blue-green gemstone has been prized by cultures all over the world for over 5,000 years. Turquoise is favored by well-known modern jewelry designers as well as aficionados of American Southwestern and Native American jewelry.

Ulexite View Profile

The fibrous material cuts interesting catseye cabochon gems, but they are curios only since they are much too soft and fragile for wear. The eye can be very strong, however. Sometimes ulexite occurs in seams, consisting of tightly packed parallel fibers. These are transparent along their length, and the packed aggregates act like an array of parallel glass fibers, displaying the pro...

uvarovite garnet ring
Uvarovite Garnet View Profile

Always a dark, rich green color, uvarovite is one of the rarest members of the garnet family. Usually only seen as druzy on matrix, these crystals are seldom faceted.

Vanadinite View Profile

A faceted vanadinite may be considered a tremendous rarity. Fewer than ten such gems may have been cut. This is unfortunate since the color is rich and beautiful. Arizona crystals tend to be very small, but the ones from Morocco reach a size of several inches.

double heart cabochon - Australia
Variscite View Profile

With beautiful green to blue-green colors and interesting patterns, variscite is a popular hobbyist material for cabochons.

Väyrynenite View Profile

The only reported gems are of Pakistani material, reddish-pink in color, and tiny.

Villiaumite View Profile

Villiaumite is seldom discussed among collectors of rare gemstones because until recently no facetable material was known. The material from Los was reported in 1976 and has been cut into tiny gemstones of deep red color. Despite their small size, they are desirable because so few stones exist. The material from Quebec is larger but very scarce. Villiaumite is somewhat water-soluble...

vivianite - Morococala Mine
Vivianite View Profile

Vivianite is so fragile and soft, any faceted gems would be difficult to handle safely, let alone wear. Nevertheless, its blue and green colors are so rich, a few stones (very few) have been cut.

Wardite View Profile

Wardite is another of the many phosphates that have been cut by collectors. It is pale colored and not terribly attractive and is fairly soft and fragile. It is seen far more frequently as cabochons than as faceted stones.

wavellite pendant
Wavellite View Profile

Wavellite is a very attractive mineral, well-known to collectors. Its radial aggregate crystal clusters can be cut into extremely interesting stones.

Weloganite View Profile

An overview on Weloganite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Weloganite gems.

Whewellite View Profile

Whewellite is one of the most unusual minerals because of its chemical composition and occurrence. It is seldom seen by collectors, and even less thought of as a faceted gemstone. It is really just a curiosity, and there is nothing intriguing about it except its rarity. The dispersion is fairly high but hard to appreciate because of the usual small size of cut gems.

Wilkeite View Profile

An overview on Wilkeite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Wilkeite gems.

shield-cut willemite - Namibia
Willemite View Profile

Willemite is prized for its intense green fluorescence. Too fragile for jewelry use, faceted specimens are extremely rare.

faceted witherite - England
Witherite View Profile

Easy to cut but too soft and fragile for jewelry, a faceted witherite would make an unusual addition to a gem collection.

Wollastonite View Profile

Interesting cabochons have been cut from wollastonite, especially from the fibrous material (which yields catseye stones) and the reddish material from Lake Superior’s lsle Royale. Wollastonite is strictly a curiosity and as a mineral is not especially rare. It resembles other white fibrous minerals, however, and is sometimes difficult to identify without using X—ray techniques....

emerald-cut wulfenite - Red Cloud Mine
Wulfenite View Profile

Although aesthetically magnificent wulfenite crystals are often too thin, soft, and sensitive to cut for jewelry, rare faceted pieces are greatly prized by collectors. The red of wulfenite, especially from the Red Cloud Mine in Arizona, is one of the richest colors in nature.

Faceted xonotlite - Italy
Xonotlite View Profile

Xonotlite is strong and can take a good polish. However, these gems are extremely rare, both as a species and cut specimens.

faceted yugawaralite
Yugawaralite View Profile

Yugawaralite is a very rare colorless to pinkish zeolite mineral. Little facetable material exists, so a cut yugawaralite would be a prized addition to a gem collection.

faceted zektzerite, 0.42 cts
Zektzerite View Profile

Small, cuttable crystals of very rare zektzerite are found only in a mountainous location in Washington state. Faceted pieces would make prized specimens for any collection of American gems.

Zincite View Profile

Zincite is a very rare mineral, essentially restricted to one important locality. Well, terminated crystals were found only up to about 3-4 inches, but larger masses, weighing several pounds, have been encountered in the ore bodies. These are not especially interesting, but cabochons with red zincite, green willemite, and white calcite, peppered with black franklinite, are unique to...

Zircon View Profile

Zircon is an underrated but magnificent gemstone. When it is properly cut, it rivals diamond in beauty, but often the cutting is not correct and the gem is relatively dull and lifeless. The dispersion is very high, close to that of diamond. Zircon is very brittle and edges of stones are easily chipped and abraded. Zircon must be worn carefully to prevent damage. The range of color i...

Zunyite View Profile

An overview on Zunyite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Zunyite gemstone.

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