Learning Center

Gem Buying Guides

Melo Pearl Buying Guide

Bright orange colors and flames that seem to dance across the surface make the melo pearl a fascinating gem choice. Learn how to find a quality specimen.…

Tridacna Pearl Buying Guide

Clam pearls can grow to be some of the largest in the world. Learn more about these aquatic gems and how to buy a top-quality tridacna pearl of your…

Classic Engagement Ring Stones

Emerald, ruby, sapphire, and diamond are the most popular choices for classic engagement ring stones. Learn more about these traditional favorites.…

Malaya Garnet Buying Guide

Rare malaya garnets come in many colors and make wonderful jewelry stones for any style. Learn the 4Cs of this gem in our malaya garnet buying guide.…

Watermelon Tourmaline Buying Guide

Looking for a fun summertime gem? Watermelon tourmaline adds a pop of color that’s perfect for a playful summer look. Learn about the quality factors…

Sapphire Buying Guide

Long associated with royalty, sapphires are some of the most popular (and expensive) gems in the world. Our sapphire buying guide will help you…

Emerald Quality Simplified

How can you evaluate emerald quality? Emeralds have many properties to consider. In particular, clarity can be very complex for these gems. Navneet…

Conch Pearl Buying Guide

Considering a conch pearl buying trip to the Caribbean? Quality factors for these gems differ from colored gemstones. Before you make a purchase,…

Chrysoprase Buying Guide

With bright, apple-green hues, chrysoprase makes an attractive, eye-catching jewelry stone. If you’re looking for a top-quality gem, read…

Ammolite Buying Guide

With bright rainbow iridescence, ammolite is sure to draw attention. Read about this gem’s unique quality factors before your next ammolite…

Rutilated Quartz Buying Guide

Silky golden rutile inclusions in quartz have become quite popular. Read our rutilated quartz buying guide to help you choose a stone for your next…

Iolite Buying Guide

Soft, violet-blue hues have made iolite a popular stone. Read about the quality factors for this trendy gem in our iolite buying guide.

Paraíba Tourmaline Buying Guide

Paraíba’s neon blue hues stunned the gem world in the 1980s. Read about the quality factors for this striking gem in our paraíba tourmaline…

Demantoid Garnet Buying Guide

Stunning green hues and a brilliance that outshines diamond combine to make demantoids truly captivating. Read more in our demantoid garnet buying…

Citrine Buying Guide

Citrine’s affordable autumn hues make it a great option for trendy jewelry. Read about the quality factors for this stylish gem in our citrine…

Kunzite Buying Guide

Rare and fragile, kunzite challenges lapidaries and delights jewelry aficionados. Our kunzite buying guide can help you add this gem to your collection.…

Crystalline Quartz Buying Guide

Although often overlooked, quartz is available in many styles at reasonable prices. Our crystalline quartz buying guide can help you pick your…

Amber Buying Guide

One of the earliest known gems, amber’s bright sunshine hues delight and enthrall. Learn more about this ancient gem’s qualities in our amber…

Precious Coral Buying Guide

Deep-water coral displays bright, rich reds and delicate pinks. Our precious coral buying guide will help you choose a gem for your next jewelry…

Garnet Buying Guide

With so many colors and varieties available, garnet buying can be daunting. Whether starting your collection or completing it, our guide can help.…

Tourmaline Buying Guide

Known for stunning, saturated hues, tourmaline is a colorful and modern gemstone. Read about quality factors for this gem in our tourmaline buying…

Moonstone Buying Guide

With sheen reminiscent of moonlight, moonstone is treasured across civilizations. Our moonstone buying guide can help you pick a gem for your…

Jade Buying Guide

“The Stone of Heaven,” jade has an unmatched elegance. Learn more about the unique quality factors of both jadeite and nephrite in our jade…

Zircon Buying Guide

Long valued for its brilliance, zircon is a natural and affordable beauty. Learn more about the quality factors for this gem in our zircon buying…

Agate Buying Guide

Decorative, patterned forms of agate are excellent natural gems. Learn more about agate’s mesmerizing patterns in our agate buying guide.

Tanzanite Buying Guide

More than just a simulant for sapphire, tanzanite’s vivid hues have stunned the gem world. Our tanzanite buying guide can help you find a gem you’ll…

Alexandrite Buying Guide

Vivid color change makes alexandrite one of the world’s most coveted stones. Our alexandrite buying guide can help you find the best gem for your…

Turquoise Buying Guide

Revered for millennia, sky blue turquoise still has a dedicated following. Our turquoise buying guide can help you pick a gem for your next jewelry…

Pearl Buying Guide

In this golden age of pearls, a wide variety of shapes, sizes, and colors are available. Our pearl buying guide can help you select a pearl you’ll…

Aquamarine Buying Guide

No gem evokes the blue-green colors of the sea like aquamarine. Our aquamarine buying guide can help you choose the best gemstone for your jewelry…

Morganite Buying Guide

Morganite has become a popular jewelry stone, especially for engagement rings. Our morganite buying guide can help you pick a great gem for any…

Amethyst Buying Guide

Long valued for its purple color and symbolic associations, amethyst is a versatile gem. Our amethyst buying guide can help you pick an excellent…

Lapis Lazuli Buying Guide

Our lapis lazuli buying guide can help you learn how to grade these gems, what to avoid, and how to identify a high quality stone or a bargain in the…

Emerald Buying Guide

Our emerald buying guide can help you learn how these gems are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.…

Peridot Buying Guide

Our peridot buying guide can help you learn how these gems are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.…

Sphalerite Buying Guide

Our sphalerite buying guide can help you learn how these gems are graded, what to avoid, and how to identify a high quality stone or a bargain in the…

Chrome Tourmaline Buying Guide

Rare chrome tourmaline can show an emerald-like green color. With a highly desired color and tourmaline’s excellent jewelry stone qualities,…

Rubellite Tourmaline Buying Guide

Like all tourmaline gemstones, rubellite wears well in almost any type of jewelry. This stone’s raspberry-like color draws a great deal of attention.…

Oregon Sunstone Buying Guide

Our Oregon sunstone buying guide can help you learn how these gems are graded and how to identify a high quality stone or a bargain in the rough.

Spinel Buying Guide

Our spinel buying guide can help you learn how spinels are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.…

Opal Buying Guide

Our opal buying guide can help you learn how opals are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.

Topaz Buying Guide

Our topaz buying guide can help you learn how topazes are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.…

Ruby Buying Guide

Our ruby buying guide can help you learn how rubies are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.