17. Nov IGC 2025 Padparadscha Sapphire & heat treatment Stephen Kennedy Download Pdf SapphireTreatments
17. Nov IGC 2025 A convincing glass imitation of larimar (pectolite) Larimar, a massive blue variety of the mineral pectolite, belonging to the wollastonite group of min Read More Elodie
17. Nov IGC 2025 Gemological Characteristics of New Transparent Brown Sapphire A newly observed variety of faceted transparent brown sapphire has recently entered the gem market, Read More Laurent Cartier
17. Nov IGC 2025 Noble gas in corundum: interests in gemology Noble gases —elements of the last column of the periodic table—are chemically defined by their f Read More Elodie
