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Peridot: A Gem with Extraterrestrial Origins

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AI to Revolutionize Diamond Clarity Grading

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Corundum and Beryl Color, Jade Artistry, and the Chivor Emerald Mine’s History...

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布谷加速器手机下载

Micro-world

Phenomenon Resembling Play-of-Color in Sapphire

Subtle tilting of the unheated sapphire revealed a noteworthy phenomenon resembling play-of-color, which is most commonly seen in precious opal.
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GIA Knowledge Sessions

Engage in webinars on the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemology.
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Lab Notes

Formation of the “Matryoshka” Diamond from Siberia

A freely moving diamond crystal completely enclosed in a diamond from Siberia gets its name from the famous Russian nesting dolls.
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Feature Article

G&G Announces Most Valuable Article Awards

G&G announces the winners of the Dr. Edward J. Gübelin Most Valuable Article Awards for 2019.
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The symbol of medicine, the caduceus (wings on each side of the top of a staff with two snakes intertwined around it) stabbing thru the coronavirus. A garnet sits at the top of the staff.

Feature Article

A Pin for Coronavirus Health Care Fighters

GIA graduate Franco Valobra creates a commemorative pin to recognize health care workers on the frontline of the coronavirus battle for survival.
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