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Fall 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source

G&G Brief presents an overview of the content of the Fall 2015 issue of Gems & Gemology.

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Multi-colored gems are superimposed on an image of glacier peaks.
Article
Gems and Minerals from the Subarctic

Circumnavigate the boreal reaches of the globe to explore gems from polar regions.

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Parisite inclusion in emerald.
Inclusions in Natural, Synthetic, and Treated Emerald

Provides a visual guide to the internal features of natural, synthetic, and treated emeralds.

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7.11 ct emerald with a large purple inclusion
Unusual Purple Inclusion in Emerald

Microscopic examination of an emerald revealed a purple banded inclusion with the appearance and optic character of fluorite.

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Emeralds from Musakashi, Zambia
Three-Phase Inclusions in Emerald and Their Impact on Origin Determination

Discusses the role of three-phase inclusions in emerald, in combination with spectroscopy and trace-element analysis, in determining geographic origin.

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Emerald cabochon with six-rayed star.
Large Star Emerald

An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.

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Unusual Curved Color Zoning In Emerald

A report on a 1.17 ct emerald obtained in Kabul, Afghanistan for GIA's permanent reference collection

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Emeralds from the Ural Mountains, USSR
Emeralds from the Ural Mountains, USSR

Emeralds are again being mined in the historic district of the Ural Mountains. Physical, chemical, spectroscopic, and microscopic characteristics of stones from the recent production are presented and compared with data on older samples as well as those reported in the literature.

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Confusing, Triangular Inclusions in an Art Deco-Style Pin
Spring 1991 G&G Lab Notes

This section, from the Spring 1991 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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The Lennix Synthetic Emerald

An examination of the gemological properties of a French flux fusion-grown synthetic emerald.

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