Caractéristiques des corindons chauffés et traités par diffusion. Published in Journal Suisse des horlogers et bijoutiers-orfèvres, 1982.
Author(s): H.A. Haenni
Ein Smaragdvorkommen in Madagaskar. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1982.
Author(s): H.A. Haenni
A contribution to the separability of natural and synthetic emeralds. Published in Journal of Gemmology, 1982.
Author(s): H.A. Haenni
Blue colour-changing kyanite from East Africa. Published in Journal of Gemmology, 1982.
Author(s): G. Bosshart, E. Frank, H.A. Haenni, N. Barot
Golden yellow tourmaline of gem quality from Kenya. Published in Journal of Gemmology, 1981.
Author(s): H.A. Haenni
First occurence of gem sphene in Sri Lanka. Published in Journal of Gemmology, 1981.
Author(s): M. Gunawardene, H.A. Haenni
This article contains a short survey on the stability of zirconias and their growth as stable cubic single crystals, followed by physical and crystallographic data on transparent rough and brilliant-cut material. The chemical compositions of yttria-stabilitzed zirconias is verified by means of rarely used formulas.
Author(s): G. Bosshart