Summer 2021 - Volume 57, Issue 2

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the quarterly journal of the gemological institute of america


Editorial

Effects of Blue Fluorescence on Diamond Appearance, Color Treatment and Brightening of “Edison” Pearls, and a Pioneering Gemstone Market in Pakistan

Duncan Pay, Editor-in-Chief


An overview of the Summer 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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This topaz crystal from Minas Gerais, Brazil, shows interesting circular etch patterns on a prism face, while subsurface fractures display vivid interference colors. This image was taken using epi scopic differential interference contrast microscopy. Photomicrograph field of view 1.44 mm.

Micro-World

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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THE DR. EDWARD J. GÜBELIN

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