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A face-up view of a cushion cut diamond with blue color.
Article
Gems & Gemology’s 7 Most Unusual Encounters from 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

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

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

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Micro-Features of Ruby
Inclusions in Natural, Synthetic and Treated Ruby

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

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A petrographic thin section of ruby-diaoyudaoite slag.
Metallic Chromium Inclusions in Industrial By-Product Ruby

Inclusions in technogenic ruby slag help to separate this material from other specimens, both natural and synthetic.

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Article
Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

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

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Flux-Induced Fingerprint Patterns in Synthetic Ruby: An Update

Some manufacturers are known to have treated Verneuil flame-fusion synthetic rubies by immersion in a flux melt to induce patterns like the “fingerprints” seen in some natural rubies.

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Rubies and Fancy Sapphires from Vietnam
Rubies and Fancy Sapphires from Vietnam

Gem-quality rubies and pink to purple sapphires are being recovered from the Luc Yen and Quy Chau mining regions of Vietnam.

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Heat Treating Corundum: The Bangkok Operation

An overview of the potential effects that heat treatment can have on corundum.

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Heat Treating Ruby and Sapphire: Technical Aspects

A review of heat treatment methods available for use on natural or synthetic corundum.

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Induced Fingerprints

This article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.

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