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New Synthetic Rubies Made by Professor P. O. Knischka

A new synthetic ruby is discussed.

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Gemstones of Pakistan: Emerald, Ruby, and Spinel

This article reports on three gem materials currently being mined in Pakistan.

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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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Pinpoint Illumination: A Controllable System of Lighting for Gem Microscopy

A review of a very useful hand-held tool for jewelers and gemologists.

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Sri Lanka: The Gem Island

An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.

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San Carlos Peridot

Marketed throughout the world, San Carlos material is often confused with, and sold as, peridot from localities that are better known and documented.

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Ruby in Diamond

The first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.

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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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Synthetic Moissanite: A New Diamond Substitute

Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterize it.

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Natural Diamond
A Chart for the Separation of Natural and Synthetic Diamonds

Exploration of a chart designed to give jewelers and gemologists a practical guide to identifying synthetic diamonds as they enter the jewelry trade.

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