17. Nov IGC 2025 Geographic Origin Determination of Natural Yellow Sapphires: The Preliminary Study Montira Seneewong-Na-Ayutthaya, Bhuwado Wanthanachaisaeng, Thanong Leelawatanasuk, Wilawan Atichat, Sirinapa Saengdech, Pimlapat Kamkaew and Tasnara Sripoonjan Download Pdf OriginsSapphire
17. Nov IGC 2025 On the nature of blue rose quartz Over the past several years, the market for pink-coloured rose quartz has been augmented by variants Read More Laurent Cartier
17. Nov IGC 2025 Spinel from Sri Lanka – An update Most of the spinels are found in shades of red to purple. Colourless, green and cobalt bearing varie Read More Elodie
17. Nov IGC 2025 Historic Emeralds and their Geographic Origin: A Retrospective Study When it comes to the geographic origin of gems, curiously enough, historians sometimes put forward p Read More Elodie