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.
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.
A brief review of traceability and blockchain for gemstones
A brief review of traceability and blockchain for gemstones. Published in GemGuide, September/October 2019, 2-4.
SSEF On-site testing in Hong Kong, 17 – 23 June 2019
We will be in Hong Kong 17 – 23 June offering our on-site testing services, during the upcoming Hong Kong Jewellery and Gem Fair. Equipped with our mobile instruments and spectrometers, we will be testing coloured gemstones (no diamonds or pearls) at the Convention & Exhibition Centre (CEC, 20 – 23
SSEF in Las Vegas at Antiques Show (May 30 – June 3, Booth: 153)
SSEF will be exhibiting at the Las Vegas Antique Jewelry & Watch Show May 30 – June 3 2019. We will be offering coloured gemstone express testing services at our booth 153 at the Las Vegas Convention Center. SSEF Las Vegas Antique Jewelry & Watch Show Booth 153 Las Vegas Convention Center 30 Ma
SSEF Performs First-Ever Radiocarbon Age-Dating Procedure on Historic ‘Ana Maria Pearl’
The Swiss Gemmological Institute SSEF has successfully age-dated the historic ‘Ana Maria Pearl’ using carbon-14 (14C). This is the first time such a procedure has been conducted on a historic natural pearl, to provide valuable and new information on the age of a gem. Read Press Release (PDF)
The Talisman of Charlemagne: New Historical and Gemological Discoveries
The Talisman of Charlemagne: New Historical and Gemological Discoveries. Published in Gems & Gemology, 2019, 55(1), 30-46.
Gemmological Analysis of a Roman Sapphire Intaglio and Its Possible Origin
Gemmological Analysis of a Roman Sapphire Intaglio and Its Possible Origin. Published in Journal of Gemmology, 2019, 36(8), 710-724.
Sapphires Heated with Pressure – A Research Update
Sapphires Heated with Pressure – A Research Update. Published in InColor, Spring 2019, 86-90.