23. Oct IGC 2023 Colour change Paraiba tourmaline from Brazil By Claudio C. Milisenda, Stefan Müller Download Pdf Tourmaline
23. Oct IGC 2023 Explanation on Yellow, Green and Brown Coloration Series of Basalt Related Bangkaja Sapphires The basalt related Bangkaja sapphires, excluding the black star ones, commonly occur in three colora Read More Elodie
23. Oct IGC 2023 Effects of Gamma Irradiation on Ruby and Pink Sapphire and Potential Detection Methods in Gem Labs Gamma irradiation is a non-destructive and non-invasive treatment method used to enhance the colour Read More Elodie
23. Oct IGC 2023 The Banjarmasin Diamond in Amsterdam – War Booty from Borneo The Banjarmasin diamond in the collection of the Rijksmuseum in Amsterdam plays a questionable role Read More Elodie
