Purple Mozambique Garnet
In early 2016, attractive bright purple garnets arrived at SSEF in Bangkok, Basel and Hong Kong. Based on client information, they are from a new mine, Padagaga in the Chimoio area in Mozambique, which was discovered recently.
Grandidierite and other Rare Gemstones at SSEF
We would like to present three minerals which were tested in the past few months at SSEF and which at least partially made headlines in the news for collectors and aficionados of such gemmological rarities.
Exceptional Spessartine Garnets
first published in Facette 21 (February 2014) In 2013, the SSEF tested a number of very outstanding spessartine garnets. This manganese dominated member of the garnet group commonly shows a highly attractive and vivid orange colour and is thus also known and described in the trade as ‘Mandarin garnet
Exceptional Colour Change Garnets Showing the Usambara Effect
by Dr. M.S. Krzemnicki, first published in Facette 21 (February 2014) Colour change, also known as“alexandrite effect” has been studied extensively since it was first described in 1831 for alexandrite (chromium-bearing variety of chrysoberyl) from Russia (von Pott, 1842). Since then, numerous minerals or g
Gemstones of the Garnet Group – about mixed crystals and solid solution
Gemstones of the Garnet Group – about mixed crystals and solid solution. Published in Journal of the Gemmological Association of Hong Kong GAHK, 2019, Volume XL, 36-49.
Grossular from Tanzania with Uncommon Inclusions
Grossular from Tanzania with Uncommon Inclusions. Published in Journal of Gemmology, 36(6), 500-501.
Yellow danburite from Namalulu, Tanzania, and Myanmar: Origin of Colour and Its Stability
Yellow danburite from Namalulu, Tanzania, and Myanmar: Origin of Colour and Its Stability. Published in Journal of Gemmology, 35, 5, 384-386. Author(s): C.P. Smith, M.S. Krzemnicki
Yellow danburite from Namalulu, Tanzania: Gemmological properties and chemical composition
Yellow danburite from Namalulu, Tanzania: Gemmological properties and chemical composition. Published in Journal of Gemmology, 2017, 35, 5, 381-384. Author(s): C.P. Smith, M.S. Krzemnicki, H.A.O. Wang
Sannan-Skarn, ein neuer Schmuckstein aus Pakistan
Sannan-Skarn, ein neuer Schmuckstein aus Pakistan – Sannan-skarn, a new gemstone from Pakistan. Published in Zeitschrift der Deutschen Gemmologischen Gesellschaft, 2016, 65, 1-2, 41-46. Author(s): H.A. Haenni, L. Franz
Zircon – A very old gemstone
Zircon – A very old gemstone. Published in Journal of Gemmological Association of Hong Kong GAHK, 2016, 37, 37-41. Author(s): H.A. Haenni