17. Nov IGC 2025 Low Temperature Heat Treatment of Madagascar Sapphire E. Billie Hughes and Rosey Perkins Download Pdf SapphireTreatments
17. Nov IGC 2025 Shining light on “480 nm band” diamonds: Gemmological characteristics of an unusual group of diamonds with yellow and red luminescence Fancy colour diamonds that derive their colour from nitro- gen-related defects (such as N3/N2 center Read More Elodie
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 A Photo Survey of Inclusions in Fossiliferous Amber For many, fossiliferous tree resin, primarily amber, gained wide visibility to the public in 1993 wh Read More Elodie
