Gemmological properties and chemical composition of gem-quality taaffeites and musgravites from Sri Lanka and Africa. Published in GIT Proceedings, 2006.
Author(s): K. Schmetzer, M.S. Krzemnicki, H.A. Haenni, H.-J. Bernhardt
Are new sapphires from Sri Lanka diffusion-treated or not? Published in Jewellery News Asia, 2004.
Author(s): H.A. Haenni
Reliability of origin determinations for gemstones. Published in Gemological Digest, 1990.
Author(s): H.A. Haenni
Ursache des Katzenaugen-Effekts bei erhitzten Zirkonen aus Sri Lanka. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1989.
Author(s): H.A. Haenni
Certitude de la détérmination d’origine. Published in Revue AFG, 1989.
Author(s): H.A. Haenni
Origin of the cat’s eye effect in heat-treated zircons from Sri Lanka. Published in Journal of Gemmology, 1988.
Author(s): H.A. Haenni, M. Weibel
Untersuchungen an Titanit, einem für Sri Lanka neuen Edelstein. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1982.
Author(s): H.A. Haenni
Ferroaxinite – another new gem from Sri Lanka. Published in Journal of Gemmology, 1982.
Author(s): H.A. Haenni, M. Gunawardene
First occurence of gem sphene in Sri Lanka. Published in Journal of Gemmology, 1981.
Author(s): M. Gunawardene, H.A. Haenni