The Beryl Group – an Overview
The Beryl Group – an Overview. Published in Journal of […]
Rarities and Collector Stones Tested at SSEF
The daily routine at SSEF usually consists of testing rubies, sapphires, emeralds, pearls and diamonds. Although sometimes challenging and interesting, especially taking into account the quality and the documented historical provenance of some of these gems and jewellery items, it is also always of great intere
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.
U–Pb Dating of Zircon and Zirconolite Inclusions in Marble-Hosted Gem-Quality Ruby and Spinel from Mogok, Myanmar
U–Pb Dating of Zircon and Zirconolite Inclusions in Mar […]
Exceptional Spessartine Garnets
first published in Facette 21 (February 2014) In 2013, […]
Exceptional Colour Change Garnets Showing the Usambara Effect
by Dr. M.S. Krzemnicki, first published in Facette 21 ( […]
Colour varieties of gems: where to set the boundary
Colour varieties of gems: where to set the boundary? Pu […]
Where is the boundary between colour varieties of gems? (2019)
Red Ruby or Pink Sapphire, that’s the Question. Where is the boundary between colour varieties of gems? Presentation by Dr. Michael S. Krzemnicki, SSEF at European Gemmological Symposium (EGS) 2019 in Idar-Oberstein.
Grossular from Tanzania with Uncommon Inclusions
Grossular from Tanzania with Uncommon Inclusions. Publi […]
Gemmological Analysis of a Roman Sapphire Intaglio and Its Possible Origin
Gemmological Analysis of a Roman Sapphire Intaglio and […]