Émeraudes synthétiques hydrothermales Agee – Hydrothermal-synthetische Smaragde von Agee. Published in 1994.
Author(s): H.A. Haenni, L. Kiefert, J.-P. Chalain
How to identify Douros synthetic rubies. Published in Jewellery News Asia, 1994.
Author(s): H.A. Haenni, K. Schmetzer
Structural and chemical investigations on shells and pearls of nacre-forming saltwater and freshwater bivalve molluscs. Published in Journal of Gemmology, 1994.
Author(s): H.A. Haenni
Rissfuellungen bei Diamanten – Les diamants traités. Published in 1993.
Author(s): E.P. Jegge
Spectroscopy and its application in gemmology. Published in 1993.
Author(s): H.A. Haenni
Das strahlende Blau der behandelten Topase. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1993.
Author(s): M. Huegi
Why epoxy-filled emeralds must be accepted. Published in 1993.
Author(s): H.A. Haenni
Origin determination for gemstones: possibilities, restrictions, reliability. Published in 1993.
Author(s): H.A. Haenni
La synthése hydrothermale en Australie: émeraude et béryl rose. Published in Journal Suisse d’Horlogerie et de Bijouterie, 1993.
Author(s): H.A. Haenni
Hydrothermal synthetic emeralds from Australia: emeralds and pink beryls. Published in 1993.
Author(s): H.A. Haenni