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Mozambican ruby with signs of heat Treatment
Colored Stones and Pearls

Poster abstracts on “Colored Stones and Pearls” from GIA’s 2018 International Gemological Symposium.

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Color distribution in nitrogen-doped CVD after irradiation and annealing
Diamond Identification

Poster abstracts on “Diamond Identification” from GIA’s 2018 International Gemological Symposium.

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Nephrite from Luodian, China
Gem Characterization

Poster abstracts on “Gem Characterization” from GIA’s 2018 International Gemological Symposium.

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Sapphires from Bingham Canyon (Utah) and Yogo Gulch
Gem Localities and Formation

Poster abstracts on “Gem Localities and Formation” from GIA’s 2018 International Gemological Symposium.

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Sintered zirconia necklace
New Technologies and Techniques

Poster abstracts on “New Technologies and Techniques” from GIA’s 2018 International Gemological Symposium.

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Star rhodochrosite from the Sweet Home mine, Colorado
Colored Stones and Pearls

Abstracts of speaker presentations from the “Colored Stones and Pearls” session of GIA’s 2018 International Gemological Symposium.

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Inclusion features in Zimmi diamonds
Diamond Geology

Abstracts of speaker presentations from the “Diamond Geology” session of GIA’s 2018 International Gemological Symposium.

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Canary yellow diamond
Diamond Identification

Abstracts of speaker presentations from the “Diamond Identification” session of GIA’s 2018 International Gemological Symposium.

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CLIPPIR diamond from Angola’s Lulo mine
Gem Characterization

Abstracts of speaker presentations from the “Gem Characterization” session of GIA’s 2018 International Gemological Symposium.

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Bicolor topaz with white fluorite inclusions from Ukraine
Gem Localities and Formation

Abstracts of speaker presentations from the “Gem Localities and Formation” session of GIA’s 2018 International Gemological Symposium.

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