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
Glassy fillings: a loupe just isn’t enough. Published in ICA Gazette, 1993.
Author(s): H.A. Haenni
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. Published in Rapaport Diamond Magazine, 1993.
Author(s): H.A. Haenni
New fracture-filling materials have replaced oil. Published in ICA Gazette, 1992.
Author(s): H.A. Haenni
Identifications des fissures traitées. Published in Revue A.F.G., 1992.
Author(s): H.A. Haenni
Identification of fissure-treated gemstones. Published in Journal of Gemmology, 1992
Author(s): H.A. Haenni