De Beers Natural versus Synthetic Diamond Verification Instruments
Christopher M. Welbourn, Martin Cooper, and Paul M. Spear
Introduction to Analyzing Internal Growth Structures: Identification of the Negative d Plane in Natural Ruby
Christopher P. Smith
Russian Flux-Grown Synthetic Alexandrite
Karl Schmetzer, Adolf Peretti, Olaf Medenbach, and Heinz-Jürgen Bernhardt
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