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Santa Terezinha De Goias Emeralds
The Santa Terezinha De Goias Emerald Deposit

Brazil has become a leading producer of emeralds; this article examines one of the most significant deposits.

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Natural-Color Pink, Purple, Red, and Brown Diamonds: Band of Many Colors

Summarizes data collected by GIA on more than 90,000 natural diamonds in this color range and presents their gemological and spectroscopic properties.

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Color-change diaspore
The Color Origin of Gem Diaspore: Correlation to Corundum

Examines the color origin of color-change diaspore, known commercially as Zultanite, and compare the effectiveness of the chromophores it shares in common with corundum.

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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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FTIR spectrum and DiamondView images of type Ib-IaA diamond
Diamond Geology

Poster abstracts on “Diamond Geology” 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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Victorian Whitby jet
General Gemology and Jewelry

Poster abstracts on “General Gemology and Jewelry” 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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Photo Montage

Scenes from the 2018 GIA International Gemological Symposium

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