Irisierendes natürliches Glass aus Mexiko
Irisierendes natürliches Glass aus Mexiko. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1989. Author(s): H.A. Haenni
Origin of the cat’s eye effect in heat-treated zircons from Sri Lanka
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
Grenats – une famille de gemmes multicolores
Grenats – une famille de gemmes multicolores. Published in Journal Suisse d’Horlogerie et de Bijouterie, 1987. Author(s): H.A. Haenni
Granate – eine farbenfrohe Edelstein-Familie
Granate – eine farbenfrohe Edelstein-Familie. Published in Schweizer Uhren- und Schmuckjournal, 1987. Author(s): H.A. Haenni
Garnets – a colourful gemstone family
Garnets – a colourful gemstone family. Published in Swiss Watch & Jewelry Journal, 1987. Author(s): H.A. Haenni
Untersuchungen an Titanit, einem für Sri Lanka neuen Edelstein
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
Ferroaxinite – another new gem from Sri Lanka. Published in Journal of Gemmology, 1982. Author(s): H.A. Haenni, M. Gunawardene
Blue colour-changing kyanite from East Africa
Blue colour-changing kyanite from East Africa. Published in Journal of Gemmology, 1982. Author(s): G. Bosshart, E. Frank, H.A. Haenni, N. Barot
First occurence of gem sphene in Sri Lanka
First occurence of gem sphene in Sri Lanka. Published in Journal of Gemmology, 1981. Author(s): M. Gunawardene, H.A. Haenni