Origin of the cat’s eye effect in heat-treated zircons from Sri Lanka. Published in Journal of Gemmology, 1988.
Author(s): H.A. Haenni, M. Weibel
An oil well in your garden. Published in Swiss Watch and Jewelry Journal, 1988.
Author(s): H.A. Haenni
The emeralds from the Belmont Mine, Minas Gerais, Brazil. Published in Journal of Gemmology, 1987.
Author(s): H.A. Haenni, D. Schwarz, M. Fischer
On corundums from Umba, Tanzania. Published in Journal of Gemmology, 1987.
Author(s): H.A. Haenni
Grenats – une famille de gemmes multicolores. Published in Journal Suisse d’Horlogerie et de Bijouterie, 1987.
Author(s): H.A. Haenni
Granate – eine farbenfrohe Edelstein-Familie. Published in Schweizer Uhren- und Schmuckjournal, 1987.
Author(s): H.A. Haenni
Garnets – a colourful gemstone family. Published in Swiss Watch & Jewelry Journal, 1987.
Author(s): H.A. Haenni
Die Smaragde der Belmont-Mine bei Itabira, Minas Gerais, Brasilien: Vorkommen und Charakteristika. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1987.
Author(s): H.A. Haenni, D. Schwarz, M. Fischer
Dégâts occasionnés aux diamants taillés. Published in journal Suisse des horlogers et des bijoutiers-orfèvres, 1987.
Author(s): H.A. Haenni, G. Bosshart
Damage to cut diamond. Published in Journal of Gemmology, 1987.
Author(s): H.A. Haenni, G. Bosshart