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Emmanuel Fritsch, Shane F. McClure, Mikhail Ostrooumov, Yves Andres, Thomas Moses, John I. Koivula, and Robert C. Kammerling
Some Diagnostic Features of Russian Hydrothermal Synthetic Rubies and Sapphires
Karl Schmetzer and Adolf Peretti
The Separation of Natural from Synthetic Colorless Sapphire
Shane Elen and Emmanuel Fritsch
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