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.
The Santa Terezinha De Goias Emerald Deposit
Brazil has become a leading producer of emeralds; this article examines one of the most significant deposits.
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.
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.
Gemstones of Pakistan: Emerald, Ruby and Spinel
This article reports on three gem materials currently being mined in Pakistan.