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Birefringent crystals in a sapphire treated with heat and pressure
Microscopic Observations of Blue Sapphires Treated with Heat and Pressure

A previously unreported microscopic feature could be a useful indicator for corundum treated with heat and pressure.

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Emerald filled with epoxy resin
Emeralds Filled with Epoxy Resin: DiamondView Observations

“Blue flashes” seen with the DiamondView help to analyze the quantity and variety of emerald-filling substances.

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Synthetic moissanite coated with a thin colored film
Coated Pink Synthetic Moissanite

A pink synthetic moissanite is coated with a thin colored film, raising questions about the natural origin of its color.

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Montana sapphires after two rounds of heating
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits

Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.

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Assortment of Linde synthetic star rubies and sapphires
Dual-Color Double Stars in Ruby, Sapphire, and Quartz: Cause and Historical Account

Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.

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Colombian Emeralds
Classifying Emerald Clarity Enhancement at the GIA Gem Trade Laboratory

One of the greatest concerns with emerald filling is the degree of clarity enhancement such treatment represents

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Article
An Introduction to Gem Treatments

A guide describing frequently encountered gem treatment processes, their detection, and special care tips for treated gems.

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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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Abstracts; Fall 2006

This article, from the Fall 2006 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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Hydrogen-rich Diamonds
Gray-To-Blue-To-Violet Hydrogen-Rich Diamonds from the Argyle Mine, Australia

The Argyle diamond mine is the only known source of type IaB hydrogen- and nitrogen-rich diamonds colored gray to blue to violet.

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