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
Zircon ou zirconia à ne pas confondre
Zircon ou zirconia à ne pas confondre. Published in Journal Suisse d’horlogerie et de bijouterie, 1989. Author(s): H.A. Haenni
Zirkon ist nicht zirkonia
Zirkon ist nicht zirkonia. Published in Schweizer Uhren und Schmuck Journal, 1989. Author(s): H.A. Haenni
Zirconia is not zircon
Zirconia is not zircon. Published in Swiss watch and jewelry journal, 1989. Author(s): H.A. Haenni
Spectrophotometric measurements of faceted rubies: critical review of an immersion technique
Spectrophotometric measurements of faceted rubies: critical review of an immersion technique. Published in Journal of Gemmology, 1986. Author(s): G. Bosshart, K. Schmetzer
Weitere Untersuchungen an farbwechselnden Edelsteinen
Weitere Untersuchungen an farbwechselnden Edelsteinen. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1983. Author(s): H.A. Haenni