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Rough blue spinel crystals from Luc Yen
Blue Spinel from the Luc Yen District of Vietnam

Offers geological context and gemological characterization of this increasingly popular vivid blue spinel from northeast Vietnam.

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Gray Corundum Coated by Black Spinel Layer
Corundum with Spinel Corona from the Tan Huong–Truc Lau Area in Northern Vietnam

Explains the reactions responsible for the formation of a well-developed reaction rim of spinel that surrounds the corundum core in some specimens from this deposit.

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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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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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Photo Montage

Scenes from the 2018 GIA 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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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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Panel of the Futurescape Forum at GIA’s 2018 Symposium
Futurescape Forum

A recap of the Futurescape Forum panel from GIA’s 2018 International Gemological Symposium.

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Colombian independent miners
Colombian Emerald Industry: Winds of Change

A firsthand look at Colombia’s emerald mines and the cutting and trading industry in Bogotá.

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Diamond octahedron, diamond bort, and carbonado
Carbonado Diamond: A Review of Properties and Origin

Presents a detailed examination of about 800 samples of carbonado diamond from Brazil and the Central African Republic, including possible models for its genesis.

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