Links and References
Links:
The Mineral and Gemstone Kingdom
International Coloured Gemstone Association
United States Geological Survey Mineral Resources Program
References:
K Nassau, Gems Made By Man, Chilton Book Company, Pennsylvania, 1980
R Webster and BW Anderson, Gems; Their Sources, Descriptions and Identification, 4th Ed, Butterworths, 1983
GF Herbert Smith and FC Phillips, Gemstones, 13th Ed, Methuen and Co Ltd, 1958
C Zandonella, From Rocks to Riches..., Newscientist, 29th May 2004, pg 26
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