Origin determination of gemstones
Author(s) : -
Date : 2014
Tags : Gemstones / Origin Determination
Presentation on origin determination of coloured gemstones by Dr. Michael Krzemnicki at 2014 Scottish Gemmological Conference.
Research Library
Outlook on pearl treatments and testing
Author(s) : -
Date : 2014
Inhorgenta Pearl Forum talk by Dr. Michael S. Krzemnicki in February 2014.
News from the lab (2014)
Author(s) : -
Date : 2014
Tags :
News from the SSEF Lab. 2014 Swiss Gemmological Society conference. Presentation by Dr. Michael Krzemnicki
DNA Fingerprinting of Pearls to Determine their Origins
Author(s) : -
Date : 2013
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
Natural and synthetic vanadium-bearing chrysoberyl
Author(s) : -
Date : 2013
Natural and synthetic vanadium-bearing chrysoberyl. Published in Journal of Gemmology, 2013, 33, 7–8, 223-238.
Author(s): K. Schmetzer, M.S. Krzemnicki, T. Hainschwang, H.-J. Bernhardt
The role of vanadium and titanium in natural and synthetic chrysoberyl and alexandrite – coloration, chatoyancy and asterism
Author(s) : -
Date : 2013
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
Colour change effects in gemstones: Causes and perception
Author(s) : -
Date : 2013
Colour change effects in gemstones: Causes and perception. Published in IGC 2013 Vietnam Abstract Proceedings, 110-113.
Author(s): M.S. Krzemnicki, W. Zhou, J. Maizlan
Some uncommon sapphire “imitations”: Blue Co-zirconia, kyanite and blue dumortierite
Author(s) : -
Date : 2013
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
Pearl or gemstone? Galatea pearls: a ‘new’ pearl product from French Polynesia
Author(s) : -
Date : 2013
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
Tracing cultured pearls from farm to consumer: A review of potential methods and solutions
Author(s) : -
Date : 2013
Tracing cultured pearls from farm to consumer: A review of potential methods and solutions. Published in Journal of Gemmology, 2013, 33, 7-8, 239-246.
Author(s) :H.A. HaenniL.E. Cartier