Raman spectroscopic investigation of zircon in gem-quality sapphire: Application in origin determination
Raman spectroscopic investigation of zircon in gem-qual […]
Beware: Laser Damage in Sapphires due to Jewellery Repair
Having personally tested gemstones for more than 20 years now, the author of this short note was quite shocked in recent months to see distinct laser damage features on quite a number of sapphires which were submitted to us by different clients.
Historic Sapphire of Catherine the Great
SSEF had the pleasure to add to this eclectic (data) collection the famous sapphire of Catherine the Great, a historic gem from Ceylon (Sri Lanka) of exceptional quality and beauty.
GemTOF Analyses of Sapphires from Madagascar and Kashmir
In the beginning of 2017, gem testing laboratories started to receive cut stones from a new area for gem analysis and issuing reports. As stated in a trade-alert by SSEF in early 2017, some of this new sapphire material may resemble internal features of Kashmir blue sapphires, therefore careful microscopic inve
The Talisman of Charlemagne: New Historical and Gemological Discoveries
The Talisman of Charlemagne: New Historical and Gemolog […]
Gemmological Analysis of a Roman Sapphire Intaglio and Its Possible Origin
Gemmological Analysis of a Roman Sapphire Intaglio and […]
Sapphires Heated with Pressure – A Research Update
Sapphires Heated with Pressure – A Research Update. Pub […]
Padparadscha-like Fancy sapphires with Unstable Colours Colouration Mechanisms and Disclosure
Padparadscha-like Fancy sapphires with Unstable Colours […]
Unstable Colouration of Padparadscha-like Sapphires
Unstable Colouration of Padparadscha-like Sapphires. Pu […]
Sapphires from Ambatondrazaka, Madagascar
Madagascar, an island of many gem treasures, saw in recent months another ‘sapphire rush’ after the discovery of a new gem deposit about 35 km east of the small town of Ambatondrazaka.