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 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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