23. Oct IGC 2023 Colour change Paraiba tourmaline from Brazil By Claudio C. Milisenda, Stefan Müller Download Pdf Tourmaline
23. Oct IGC 2023 Additional Observations on Unstable Color in Padparadscha Sapphires For the past few years laboratories have been testing the color stability of padparadscha sapphires. Read More Elodie
23. Oct IGC 2023 Sulfur-based species induced photochromism in sodalite Sodalite Na4 (Al3 Si3 O12)Cl is a natural aluminosilicate mineral that contains sulfur or sulfur-rel Read More Elodie
23. Oct IGC 2023 Blue shortwave luminescence of gems: the role of titanate groups The purpose of this study is to describe Blue Shortwave-UV excited Luminescence (BSL) in gems and re Read More Elodie
