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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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Gota de Aceite: Nomenclature for the Finest Colombian Emeralds

The finest and rarest emeralds are sometimes said to have an optical effect called gota de aceite.

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Tucson: A Showcase of Colored Gemstone Innovation

An overview of the Spring 2016 Gems & Gemology content.

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Garnets, Sapphires, Opals, and Tarnish on High-Purity Gold

An overview of the Winter 2015 Gems & Gemology content.

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Duncan Pay
Trapiche and More...

Colombia’s unique trapiche emeralds exert a fascination for many gemologists.

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Large Brazilian cat’s-eye emerald.
Large Cat’s-Eye Emerald from Brazil

A translucent Brazilian emerald exhibiting pronounced chatoyancy is examined.

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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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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Summer 2009

This article, from the Summer 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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