the quarterly journal of the gemological institute of america
In This Issue
Measurement and Characterization of the Effects of Blue Fluorescence on Diamond Appearance
Detection of Color Treatment and Optical Brightening in Chinese Freshwater “Edison” Pearls
Pearl Classification: The GIA 7 Pearl Value Factors
Namak Mandi: A Pioneering Gemstone Market in Pakistan
Previous Issue
the quarterly journal of the gemological institute of america
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.
Articles (4)
Namak Mandi: A Pioneering Gemstone Market in Pakistan
Documents Namak Mandi’s transformation from a salt market to one of Pakistan’s primary gem trading centers, with a look at the commercial activities taking place today.
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Detection of Color Treatment and Optical Brightening in Chinese Freshwater “Edison” Pearls
Analyzes a group of 23 freshwater “Edison” pearls (a trade name referring to near-round freshwater cultured pearls, usually shell bead cultured) using various gemological and advanced instrumental techniques.
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Pearl Classification: The GIA 7 Pearl Value Factors
Provides a visual guide to GIA’s approach to classifying and describing pearls.
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Measurement and Characterization of the Effects of Blue Fluorescence on Diamond Appearance
Using customized, image-based measurement systems to quantify the effect of fluorescence on the color, brightness, and transparency of gem diamonds viewed in both face-up and table-down orientations.
Read MoreRegular Features
Gem News International
Global coverage of gem sources, notable new gem materials, and recent industry developments.
View All (9)Most Valuable Article Awards
A Quantitative Description of the Causes of Color in Corundum
Emily V. Dubinsky, Jennifer Stone-Sundberg, and John L. Emmett
History of the Chivor Emerald Mine, Part I (1880–1925): From Rediscovery to Early Production
Karl Schmetzer, Gérard Martayan, and Jose Guillermo Ortiz
Naturally Colored Yellow and Orange Gem Diamonds: The Nitrogen Factor
Christopher M. Breeding, Sally Eaton-Magaña, and James E. Shigley
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