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HPHT-processed yellow rough diamond.
Yellow HPHT-Processed Rough Diamond

HPHT annealing of a nearly eye-clean yellow natural rough diamond is revealed through spectroscopic analysis.

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Article
Instruments Revolutionize Gem Identification Process

An overview of how GIA's instrument development helped gemologist identify gemstones

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Diamond and fraudulent inscription.
HPHT-Processed Diamond Fraudulently Represented as Untreated

An HPHT-treated round brilliant diamond with an inscription that presents as a GIA report number is found to be inconsistent with the institute's report, previously issued for an untreated diamond.

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Observations on GE-Processed Diamonds: A Photographic Record

Observations made at GIA on 858 GE-processed diamonds revealed several interesting features that may be diagnostic of this kind of diamond. Specifically, a significant percentage exhibited a slightly hazy appearance, noticeable internal graining, and other unusual internal features.

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Coloring of Topaz by Coating and Diffusion Processes: An X-Ray Photoemission Study of What Happens Beneath the Surface

Surface-treated topaz has become a viable alternative to topaz colored by irradiation.

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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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The Oil Treatment of Emeralds in Bogotá, Colombia

This article focuses on Colombian emeralds and gives a detailed explanation of the oiling process as observed by the author.

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Clues to the Process Used by General Electric to Enhance the GE POL Diamonds

General Electric has developed a variety of high-temperature annealing techniques at different pressures for enhancing the optical properties of polycrystalline synthetic diamond films and single-crystal synthetic diamond.

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Opal slices before and after water immersion
Hydrophane Opal Treatment

An opal rough is immersed in water and treated with oil and Opticon to observe effects on transparency and play-of-color.

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Mining site at Zahamena National Park, Madagascar
The Color of Responsibility: Ethical Issues and Solutions in Colored Gemstones

Examines the challenges of ethical sourcing and production of colored stones, and what some industry leaders are doing to address the situation.

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