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 pearls an
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
Twinned cultured pearl
Twinned cultured pearl. Published in Gems & Gemology, 2008. Author(s): H.A. Haenni
The different kinds of cultured pearls
The different kinds of cultured pearls. Published in GIT Proceedings, 2008. Author(s): H.A. Haenni