Caractéristiques des corindons chauffés et traités par diffusion
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
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
A contribution to the separability of natural and synthetic emeralds. Published in Journal of Gemmology, 1982. Author(s): H.A. Haenni
Golden yellow tourmaline of gem quality from Kenya
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
First occurence of gem sphene in Sri Lanka. Published in Journal of Gemmology, 1981. Author(s): M. Gunawardene, H.A. Haenni