Visit to Tanzanian spinel and corundum deposits (2010)
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
How to get the blues out of the pink- detection of low temperature treatment of pink sapphires (2010)
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
Observations on treated ruby and sapphire
Observations on treated ruby and sapphire. Published in Taiwan Jewellery World Magazine, 2006. Author(s): H.A. Haenni
Sapphires from New Zealand
Sapphires from New Zealand. Published in 2006. Author(s): L. Kiefert, M.S. Krzemnicki, G. Du Toit, R. Befi, K. Schmetzer
Are new sapphires from Sri Lanka diffusion-treated or not?
Are new sapphires from Sri Lanka diffusion-treated or not? Published in Jewellery News Asia, 2004. Author(s): H.A. Haenni
Orange treated sapphire: towards finding a name for a new product
Orange treated sapphire: towards finding a name for a new product. Published in GAHK Journal, 2002. Author(s): H.A. Haenni
Eine neue Diffusionsbehandlung liefert orangefarbene und gelbe Saphire
Eine neue Diffusionsbehandlung liefert orangefarbene und gelbe Saphire. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 2002. Author(s): H.A. Haenni, T. Pettke
Ein Besuch bei den Saphirkochern von Chantaburi
Ein Besuch bei den Saphirkochern von Chantaburi. Published in GoldOr, 2002. Author(s): H.A. Haenni
Investigations on sapphires from an alkali basalt, South West Rwanda
Investigations on sapphires from an alkali basalt, South West Rwanda. Published in Journal of Gemmology, 1996. Author(s): M.S. Krzemnicki, H.A. Haenni, R. Guggenheim, D. Mathys
Ein neues Vorkommen im Süden von Madagaskar
Ein neues Vorkommen im Süden von Madagaskar. Published in 1996. Author(s): L. Kiefert, K. Schmetzer, M.S. Krzemnicki, H.-J. Bernhardt, H.A. Haenni