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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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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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Abstracts; Summer 1991

From the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.

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Gemstone Enhancement and its Detection in the 2000s
Gemstone Enhancement and its Detection in the 2000s

Advances in technology and increased demand for lower-priced gem materials contributed to the proliferation of new treatments throughout the first decade of the 2000s.

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Article
Insights From Inclusions

Natural gemstones are typically far more valuable than synthetic ones, so being able to identify them correctly is a powerful skill.

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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 & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Natural Rubies with Glass-Filled Cavities

An examination and analysis of 15 natural rubies with glass-filled cavities.

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Ruby and Sapphire Production and Distribution: A Quarter Century of Change
Ruby and Sapphire Production and Distribution: A Quarter Century of Change

During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges.

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