Karl Schmetzer, March 1, 1996
A new type of Russian hydrothermal synthetic emerald is produced.
Read MoreRon Ringsrud, June 1, 1986
The Coscuez mine, one of a number in Colombia, is rapidly gaining significance as a major source of fine emeralds.
Read MoreJohn I. Koivula and Peter C. Keller, June 1, 1985
The properties and techniques of flux-grown synthetic emeralds from Russia are discussed.
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