Winter 2021 - Volume 57, Issue 4

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the quarterly journal of the gemological institute of america


Burmese Blue Sapphire and Peridot from Mogok and a History of Emerald Mining in Habachtal, Austria

Duncan Pay, Editor-in-Chief

An overview of the Winter 2021 Gems & Gemology content.

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Articles (3)

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Regular Features

Lab Notes

Lab Notes

The latest advances and findings from GIA laboratories.

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Winter 2021 Micro-World Banner


An in-depth look at the hidden world of gem inclusions.

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Gem News

Gem News International

Global coverage of gem sources, notable new gem materials, and recent industry developments.

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Colored Stones Unearthed

Colored Stones Unearthed

Explores the geological concepts related to colored stone formation.

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Most Valuable Article Awards

MVA First Place

A Quantitative Description of the Causes of Color in Corundum
Emily V. Dubinsky, Jennifer Stone-Sundberg, and John L. Emmett

MVA Third Place

Naturally Colored Yellow and Orange Gem Diamonds: The Nitrogen Factor
Christopher M. Breeding, Sally Eaton-Magaña, and James E. Shigley