Heat Treatment Experiments of Corundum – Development of a Before/After Collection

Posted on July 1, 2020 by Tom Stephan, M.Sc., FGG, EG, Benjamin Huaysan, M.Sc. & Stefan Mùˆller, M.Sc.

Color modification of ruby and sapphire by heat treatment processes has a long tradition in the gemstone industry. First written reports by Bhojarajah and Al Beruni date back to the 11th century (see Hughes, 2017),while…

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