Erkennung von Edelsteinen mit behandelten Rissen
Erkennung von Edelsteinen mit behandelten Rissen. Published in GZ, 1992 Author(s): H.A. Haenni
Considérations terminologiques au sujet des émeraudes du Nigéria de couleur bleu-vert
Considérations terminologiques au sujet des émeraudes du Nigéria de couleur bleu-vert. Published in Revue A.F.G., 1992. Author(s): H.A. Haenni
Blue-green emerald from Nigeria (a consideration of terminology)
Blue-green emerald from Nigeria (a consideration of terminology). Published in Australian Gemmologist, 1992. Author(s): H.A. Haenni
The case for blue-green emerald
The case for blue-green emerald. Published in Jewellery News Asia, 1991. Author(s): H.A. Haenni
Rubine vom Burma-Typ aus der Gegend von Morogoro in Tansania
Rubine vom Burma-Typ aus der Gegend von Morogoro in Tansania. Published in GZ, 1991. Author(s): H.A. Haenni
From Nigeria – new pale gem-quality emerald or beryl?
From Nigeria – new pale gem-quality emerald or beryl? Published in 1991. Author(s): H.A. Haenni
Edelsteine der Korundgruppe
Edelsteine der Korundgruppe. Published in Schweirische Uhrmacher- und Goldschmiede Zeitung, 1991. 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
Ein Beitrag zu den Erkennungsmerkmalen der Kaschmir-Saphire
Ein Beitrag zu den Erkennungsmerkmalen der Kaschmir-Saphire. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1990. Author(s): H.A. Haenni
A contribution to the distinguishing characteristics of sapphires from Kashmir
A contribution to the distinguishing characteristics of sapphires from Kashmir. Published in Journal of Gemmology, 1990. Author(s): H.A. Haenni