Chrysoberyl: a gem with many faces
Chrysoberyl: a gem with many faces. Published in GAHK Journal, 2010. Author(s): H.A. Haenni
Appearance of new bead material in cultured pearls
Abstract: A range of different materials has already been used as cores in beaded cultured pearls, and now two new alternative options, baroque shaped shell beads and Chinese freshwater cultured pearls, are being used. Experiments with beads of the latter, approximately 6.5 mm across, have been carried out with
X-ray computed microtomography: distinguishing natural pearls from beaded and non-beaded cultured pearls
Abstract: The distinction of natural from cultured pearls traditionally has been based on X-radiography. X-ray computed microtomography (μ-CT) has recently been applied to gain more insight into pearl structures. Using this technique, this article presents features observed in a selection of natural pearl
New rubies from Montepuez, Mozambique
New rubies from Montepuez, Mozambique. Published in Jewellery News Asia, 2009. Author(s): M.S. Krzemnicki
Moonstones and Co: a brief review of the feldspar group
Moonstones and Co: a brief review of the feldspar group. Published in 2009. Author(s): H.A. Haenni
Explaining the flame structure in non-nacreous pearls
Explaining the flame structure in non-nacreous pearls. Published in 2009. Author(s): H.A. Haenni
Damage to cut gemstones
Damage to cut gemstones. Published in The Valuer, 2009. Author(s): H.A. Haenni
Advancements in gemmological instrumentation over the last 30 years
Advancements in gemmological instrumentation over the last 30 years. Published in GAHK Journal, 2009. Author(s): H.A. Haenni
New Tanzania mine uncovers source of exceptional rubies
New Tanzania mine uncovers source of exceptional rubies. Published in InColor, 2008. Author(s): M.S. Krzemnicki, H.A. Haenni
More natural pearls tested in labs
More natural pearls tested in labs. Published in Jewellery News Asia, 2008. Author(s): H.A. Haenni