Research Library

News from the lab (2014)

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News from the SSEF Lab. 2014 Swiss Gemmological Society conference. Presentation by Dr. Michael Krzemnicki

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DNA Fingerprinting of Pearls to Determine their Origins

Abstract: We report the first successful extraction of oyster DNA from a pearl and use it to identify the source oyster species for the three major pearl-producing oyster species Pinctada margaritifera, P. maxima and P. radiata. Both mitochondrial and nuclear gene fragments could be PCR-amplified and sequenced. A polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay in the internal transcribed spacer (ITS) region was developed and used to identify 18 pearls of unknown origin. A micro-drilling technique was developed to obtain small amounts of DNA while maintaining the commercial value of the pearls. This DNA fingerprinting method could be used to document the source of historic pearls and will provide more transparency for traders and consumers within the pearl industry.

Author(s): J.B. Meyer, L.E. Cartier, E.A. Pinto-Figueroa, M.S. Krzemnicki, H.A. Haenni, B.A. McDonald

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The role of vanadium and titanium in natural and synthetic chrysoberyl and alexandrite – coloration, chatoyancy and asterism

The role of vanadium and titanium in natural and synthetic chrysoberyl and alexandrite – coloration, chatoyancy and asterism. Published in IGC 2013 Vietnam Abstract Proceedings, 84-87.

Author(s): K. Schmetzer, M.S. Krzemnicki, T. Hainschwang, H.-J. Bernhardt

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Some uncommon sapphire “imitations”: Blue Co-zirconia, kyanite and blue dumortierite

Some uncommon sapphire “imitations”: Blue Co-zirconia, kyanite and blue dumortierite. Published in Journal of the Gemmological Association of Hong Kong GAHK, 34, 62-64

Author(s): M.S. Krzemnicki

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Pearl or gemstone? Galatea pearls: a ‘new’ pearl product from French Polynesia

Pearl or gemstone? Galatea pearls: a ‘new’ pearl product from French Polynesia. Published in IGC 2013 Vietnam Abstract Proceedings, 64-66.

Author(s): L.E. Cartier, M.S. Krzemnicki, J. Rere

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