New fracture-filling materials have replaced oil
New fracture-filling materials have replaced oil. Published in ICA Gazette, 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
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
What to look for in Vasar synthetic emerald
What to look for in Vasar synthetic emerald. Published in Jewellery News Asia, 1989. Author(s): H.A. Haenni
The emeralds of Fazenda Boa Esperanca, Taua, Ceara, Brazil: occurence and properties
The emeralds of Fazenda Boa Esperanca, Taua, Ceara, Brazil: occurence and properties. Published in Journal of Gemmology, 1988. Author(s): D. Schwarz, H.A. Haenni, F.L. Martins Jr, M. Fischer
Die Smaragde der Fazenda Boa Esperenca bei Taua, Ceara, Brasilien: Vorkommen und Charateristika
Die Smaragde der Fazenda Boa Esperenca bei Taua, Ceara, Brasilien: Vorkommen und Charateristika. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1988. Author(s): D. Schwarz, H.A. Haenni, F.L. Martins Jr, M. Fischer
Wenn es ein Ölfeld im Garten gibt
Wenn es ein Ölfeld im Garten gibt. Published in Schweizer Uhren- und Schmuck-Journal, 1988. Author(s): H.A. Haenni
Lorsqu’il y a de l’huile dans le jardin
Lorsqu’il y a de l’huile dans le jardin. Published in Journal Suisse d’Horlogerie et Bijouterie, 1988. Author(s): H.A. Haenni