Ruby heat treatment and fracture repair
Ruby heat treatment and fracture repair. Published in Jewellery News Asia, 2001. Author(s): H.A. Haenni
Sapphire from Andranondambo, Madagascar
first published in Facette 22 (February 2016) In 2016, the SSEF received a sapphire of exceptional quality and size for testing (Figure 1). The sapphire of 33 ct was characterised by a saturated blue colour, – poetically also known as royal blue and a highly attractive velvety appearance due to submi
Origin of gem corundum in calcite marble: The Revelstoke occurrence in the Canadian Cordillera of British Columbia
Origin of gem corundum in calcite marble: The Revelstoke occurrence in the Canadian Cordillera of British Columbia. Published in 2015 Swiss Geoscience Meeting Proceedings, 126. Author(s) :T. DzikowskiJ. CempirekL.A. GroatG.M. DippleG. Giuliani
Be-detection by FTIR on corundum; a preliminary report
Be-detection by FTIR on corundum; a preliminary report. Published in IGC 34 Lithuania Abstract Proceedings, 69-71. Author(s): W.A. Balmer, M.S. Krzemnicki
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
Corundum Treatment (2013)
Presentation on developments in treatments of ruby, sapphire and corundum. Focus on characteristics, detection and declaration. Talk given at 2013 Swiss Gemmological Society conference by Dr. Michael Krzemnicki.
Kashmir sapphire origin determination: potential and limitations (2012)
Presentation by Dr. Michael Krzemnicki at 2012 SGG conference in Switzerland.
Colourful Treasures of Nature: Ruby, Sapphire, Emerald & Pearls (2012)
2012 Christie’s expert lecture by Dr. Michael Krzemnicki on exceptional coloured gemstones and natural pearls.
Fancy coloured sapphires: the beauty beyond “blue” of sapphire and “red” of rubies (2011)
Presentation at Swiss Gemmological Society about trip to spinel and corundum deposits in Tanzania in October 2009 by Dr. Walter Balmer and Dr. Michael Krzemnicki