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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.

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Santa Terezinha De Goias Emeralds
The Santa Terezinha De Goias Emerald Deposit

Brazil has become a leading producer of emeralds; this article examines one of the most significant deposits.

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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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The Chromium Content of Lechleitner Synthetic Emerald Overgrowth

The higher the chromium content in synthetic emerald overgrowth, the darker the coating and appearance of the stone will be.

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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.

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