New Tanzania mine uncovers source of exceptional rubies
New Tanzania mine uncovers source of exceptional rubies. Published in InColor, 2008. Author(s): M.S. Krzemnicki, H.A. Haenni
Vanadium-bearing gem-quality tourmalines from Madagascar
Vanadium-bearing gem-quality tourmalines from Madagascar. Published in Journal of Gemmology, 2007. Author(s): K. Schmetzer, H.-J. Bernhardt, C. Dunaigre, H.A. Haenni
The Origin Determination of Gemstones: Challenges and Perspectives
The Origin Determination of Gemstones: Challenges and Perspectives. Published in InColor, 2007. Author(s): M.S. Krzemnicki
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
Origin Determination of Gemstones: Challenges and Perspectives
Origin Determination of Gemstones: Challenges and Perspectives. Published in GIT Proceedings, 2006. Author(s): M.S. Krzemnicki, H.A. Haenni, P. Lefevre, J.-P. Chalain
Les nouvelles mines d’émeraudes de la Pita (Colombie)
Les nouvelles mines d’émeraudes de la Pita (Colombie). Published in Revue A.F.G. by Fritsch et al (2002)
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
Origin determination for gemstones: possibilities, restrictions, reliability
Origin determination for gemstones: possibilities, restrictions, reliability. Published in 1993. Author(s): H.A. Haenni
Reliability of origin determinations for gemstones
Reliability of origin determinations for gemstones. Published in Gemological Digest, 1990. Author(s): H.A. Haenni