Color Change Garnet Value, Price, and Jewelry Information

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This round, brilliant-cut color change garnet shows brown in compact fluorescent lighting, purple in daylight, and hot pink in incandescent lighting. 0.65 cts, 5.45 mm, Tanzania. © Dan Stair Custom Gemstones. Used with permission.

Any stone that changes color under different types of light is a rare treat for collectors. Color change garnets show the widest range of transformations in the gem world, with almost any hue possible.

Color Change Garnet Value

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Almandine Garnet - Top Color: oR, R, PR, rP 6/4

All Sizes
Almandine
to /ct

Almandine/Pyrope Garnet Blend (Mozambique) - Red-Brown Colors

All Sizes
Mozambique
to /ct

Rhodolite (Almandine/Pyrope Blend) - Fine Color: rP, PR 6/5

.5 to 1 carat
Faceted
to /ct
Cabochons
to /ct
1 to 10 carats
Faceted
to /ct
Cabochons
to /ct
10 carats plus
Faceted
to /ct
Cabochons
to /ct

Andradite - Fine Color: G 5/4

All Sizes
Andradite
to /ct

Demantoid Garnet

to 1 carat
Demantoid
to /ct
1 to 3 carats
Demantoid
to /ct

Grossular Garnet

.5 to 1 carat
Mint Green (Merelani)
to /ct
Yellow/Orange
to /ct
Yellow/Green
to /ct
Other Colors
/ct
1 to 5 carats
Mint Green (Merelani)
to /ct
Yellow/Orange
to /ct
Yellow/Green
to /ct
Other Colors
/ct to /ct
5 carats plus
Mint Green (Merelani)
to /ct
Yellow/Orange
to /ct
Yellow/Green
to /ct
Other Colors

Hessonite Garnet - Fine Color: yO 4/5

All Sizes
Hessonite Garnet
to /ct

Tsavorite Garnet - Fine Color: G 6/5

.5 to 1 carat
Tsavorite
to /ct
1 to 2 carats
Tsavorite
to /ct
2 carats plus
Tsavorite
to /ct

Mali Garnet (Andradite/Grossular Blend)

All Sizes
Mali Garnet
to /ct

Malaya (Malaia) Garnets

.5 to 1 carat
Malaya (Malaia) Garnets
to /ct
1 to 5 carats
Malaya (Malaia) Garnets
to /ct
5 carats plus
Malaya (Malaia) Garnets
to /ct

Pyrope - Fine Color: R 6/5

1 carat plus
Pyrope
/ct

Chrome Pyrope

All Sizes
Chrome Pyrope
to /ct

Spessartite Reds

.5 to 3 carats
Little 3 Mine
to /ct
African
to /ct
Darker reds
to /ct
3 to 6 carats
Little 3 Mine
to /ct
African
to /ct
Darker reds

Mandarin Garnet - Orange - Fine Color: O 4/5

All Sizes
Mandarin Orange
to /ct

Uvarovite

10 carats plus
Druzy
to /ct

Star Garnet

All Sizes
4 Ray Star
to /ct
6 Ray Star
to /ct

Color Change Garnet

.5 to 1 carat
Africa
to /ct
United States
to /ct
1 to 6 carats
Africa
to /ct
United States
to /ct

Cabochons

All Sizes
Common Red to Purple
to /ct
View Almandine Garnet Profile

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Color Change Garnet Information

Data Value
Name Color Change Garnet
Is a Variety of Garnet
Colors Various shades of red, pink, purplish red, reddish orange, red-orange, orange, brownish orange, yellowish orange, greenish, greenish yellow-brown, brown, peach, purple, blue, blueish green, green, violet. Many possible color change combinations.
Fracture Conchoidal
Hardness 6.5-7.5
Cleavage None
Crystallography Isometric
Refractive Index See the Gem Listings for specific garnet varieties.
Birefringence None
Dispersion 0.022-0.027
Absorption Spectrum See the Gem Listings for specific garnet varieties.
Pleochroism None
Optics Isotropic. May show anomalous birefringence.
Luster Vitreous
Polish Luster Vitreous
Specific Gravity 3.40-4.30 (See the Gem Listings for specific garnet varieties).
Transparency Transparent to opaque
Phenomena Color change
Birthstone January
Formula See the Gem Listings for specific garnet varieties.

Trillion-cut color change garnet (brown to red), 2.41 cts, 8.66 x 8.05 x 4.59 mm, Madagascar. Photo courtesy of liveauctioneers.com and Jasper52.

Comments

Garnets belong to a complicated family, full of surprises. Color change garnets are no exception. For many years, it was commonly said that garnets come in every color of the rainbow — except blue. Recently, this has been proven false. In the 1990s, garnets that appear blue-green in daylight and purple in incandescent light were discovered in Madagascar. These stones were a mix of predominantly pyrope and spessartite.

Blue color change garnets are exceptionally rare stones. One large specimen has sold for $1.5 million per carat.

This color change garnet from Africa shifts from blue to purple. © All That Glitters. Used with permission.

How Do You Classify Color Change Garnet?

Most, but not all, garnets that display color change consist of a mix of pyrope and spessartite, such as those blue gems as well as rare but more accessible malaia garnets. However, garnets from Idaho, primarily mixtures of almandine and pyrope, occasionally show a strong color shift from red to purplish red. Mali garnets, predominantly grossular with some andradite, may also show a color change from grayish green in fluorescent light to brown in incandescent light.

Distinguishing garnet species can be difficult. Keep in mind that color change garnets aren’t a specific garnet species or limited to a specific mixture of species. These gems will display the physical and optical properties of the species or blend to which they belong. These durable stones should also receive the same care and maintenance as all other garnets.

andradite crystals - Afghanistan

These andradite crystals on matrix display an unusual color shift. Under halogen light, they appear a pastel “mint green,” but under mercury light, they appear an intense “lime green.” 9.2 x 5.2 x 3.9 cm, Ghazni Province, Afghanistan. © Rob Lavinsky, www.iRocks.com. Used with permission.

Sources

Afghanistan, Madagascar, Norway, Sri Lanka, Tanzania, and the U.S. state of Idaho have all produced color change garnets.

Rectangular radiant-cut color change garnet (brownish tan to red-purple), 1.99 cts, 8.9 x 5.8 mm, Elahara, Sri Lanka. © The Gem Trader. Used with permission.

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