Filled emeralds: please face reality
Filled emeralds: please face reality. Published in ICA Gazette, 1993. Author(s): H.A. Haenni
A new synthetic ruby from Greece poses challenges for gemmologists
A new synthetic ruby from Greece poses challenges for gemmologists. Published in Rapaport Diamond Magazine, 1993. Author(s): H.A. Haenni
New fracture-filling materials have replaced oil
New fracture-filling materials have replaced oil. Published in ICA Gazette, 1992. Author(s): H.A. Haenni
Identifications des fissures traitées
Identifications des fissures traitées. Published in Revue A.F.G., 1992. Author(s): H.A. Haenni
Identification of fissure-treated gemstones
Identification of fissure-treated gemstones. Published in Journal of Gemmology, 1992 Author(s): H.A. Haenni
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