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Concise Reference Guide. Princeton University Press. p. 81. ISBN 978-0-691-21448-1. OCLC 1261879655. Saul, John M. (2018). "Transparent gemstones and...

Concise Reference Guide. Princeton University Press. p. 47. ISBN 978-0-691-21448-1. Read, Peter G. (2005). Gemmology. Butterworth-Heinemann. p. 13....