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Rough CLIPPIR diamonds
The Very Deep Origin of the World’s Biggest Diamonds

Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular and Resorbed), that formed in a super-deep environment.

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Colombian independent miners
Colombian Emerald Industry: Winds of Change

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

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Jadeite boulder from Itoigawa, Japan
Japanese Jadeite: History, Characteristics and Comparison with Other Sources

Examines the sources, colour, texture and chemical composition of jadeite from Japanese deposits.

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Article
The Unexpected Origins of Big Diamonds

Dr Evan Smith, Ph.D., GIA research scientist, has dedicated his work to methodically characterising the inclusions found in rare diamonds. In this video presentation recorded at the 2017 JCK Las Vegas show, Smith shares his findings on the unexpected ori

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Evan Smith studies images of diamond inclusions on a computer.
Article
Postdoctoral Programme Gives Scientists Access to Rare Research Opportunities

GIA’s postdoctoral programme gives researchers access to gemmological data, equipment, and rare, unusual and large gems in its laboratories.

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Large rough diamonds sit on a mirror.
Article
Russia’s Lomonosov Diamond Project Shows its Fancy Colours

Lomonosov yields fancy colours – purplish pink, violet, green, yellow and brown – and a high percentage of gem-quality colourless (D-to-Z) diamonds.

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Rough Emerald
Article
Seeing Green: All About Emeralds

Want to see into the future? Be an eloquent speaker? Defeat spells and enchantments? Such is the lore of the emerald.

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Recent Advances in Understanding the Geology of Diamonds

Examines the last two decades’ advances in analysing and understanding the formation of natural diamonds, and their relation to the Earth’s formation.

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