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Copyright
Editorial board: Dr. rer. nat. Tom Stephan, M.Sc., F.G.G., E.G. (responsible) and Dr. rer. nat. Ulrich Henn, Dipl.-Min., assisted by Qi Wang, M.F.A., F.G.G., E.G.
The German Gemmological Association (DGemG) reserves all rights for all contributions. The contributions are exclusively for private use. Any further use of texts and images for non-private use requires the written permission of the German Gemmological Association (DGemG).