Spring 2021 - Volume 57, Issue 1

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the quarterly journal of the gemological institute of america


Internal Structures of Natural Pearls from Pinctada maxima, Identification of Resin-Filled Turquoise, Spinel Inclusions Chart, and More……

Duncan Pay, Editor-in-Chief

An overview of the Spring 2021 Gems & Gemology content.

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Articles (4)

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Regular Features

Lab Notes

Lab Notes

The latest advances and findings from GIA laboratories.

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Cloud inclusion resembling the profile of a faceted diamond.


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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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