Mahinda Gunawardene and Mahinda S. Rupasinghe, June 1, 1986
The Elahera gem field currently provides approximately 35% of the gemstones exported from Sri Lanka.
Read MoreGary W. Bowersox, December 1, 1985
An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.
Read MoreJames E. Shigley and Carol M. Stockton, March 1, 1984
Similarities between natural spinels - with intense blue colour - and synthetic material, have led to difficulties in the recognition of the natural stones by traditional methods.
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