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Emerald
Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.
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Research
The Coscuez Mine: A Major Source of Colombian Emeralds
The Coscuez mine, one of a number in Colombia, is rapidly gaining significance as a major source of fine emeralds.
A Status Report on Gemstones from Afghanistan
An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.
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.
Emeralds of Colombia
A comprehensive review of the history and geology of Colombian emeralds together with descriptions of some of the most famous gems to come from this locality.
