the quarterly journal of the gemological institute of america
In This Issue
Natural-Color Pink, Purple, Red, and Brown Diamonds: Band of Many Colors
The History and Reconstruction of the Amber Room
The Color Origin of Gem Diaspore: Correlation to Corundum
Corundum with Spinel Corona from the Tan Huong–Truc Lau Area in Northern Vietnam
The Gemological Characteristics of Pipi Pearls Reportedly from Pinctada maculata
Inclusions in Natural, Synthetic, and Treated Diamond
Previous Issue
the quarterly journal of the gemological institute of america
Winter Reading: Pink Diamonds, Russia’s Amber Room, and More…
Duncan Pay, Editor-in-Chief
An overview of the Winter 2018 Gems & Gemology content.
Articles (6)
Natural-Color Pink, Purple, Red, and Brown Diamonds: Band of Many Colors
Summarizes data collected by GIA on more than 90,000 natural diamonds in this color range and presents their gemological and spectroscopic properties.
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The History and Reconstruction of the Amber Room
Chronicles the history of this cultural landmark, originally assembled for the Prussian king between 1701 and 1714, and its reconstruction by the Soviet Union starting in 1979.
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The Color Origin of Gem Diaspore: Correlation to Corundum
Examines the color origin of color-change diaspore, known commercially as Zultanite, and compare the effectiveness of the chromophores it shares in common with corundum.
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Corundum with Spinel Corona from the Tan Huong–Truc Lau Area in Northern Vietnam
Explains the reactions responsible for the formation of a well-developed reaction rim of spinel that surrounds the corundum core in some specimens from this deposit.
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The Gemological Characteristics of Pipi Pearls Reportedly from Pinctada maculata
Reveals the internal features and spectroscopic data of these small natural pearls and offers the means of separating them from pearls of related mollusk species.
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Chart: Inclusions in Natural, Synthetic, and Treated Diamond
Provides a visual guide to the internal features of natural, synthetic, and treated diamonds.
Read MoreRegular Features
Gem News International
Global coverage of gem sources, notable new gem materials, and recent industry developments.
View All (13)
Diamonds From the Deep
Explores the role of diamonds in our understanding of the natural world.
View All (1)
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