17. Nov IGC 2025 Blue sapphire from Malacacheta of Minas Gerais, Brazil Masaki Furuya Download Pdf Sapphire
17. Nov IGC 2025 An approach to understanding the factors in the emerald enhancement clarity grading system used at CDTECGemlab Emerald is the green variety of beryl, with its distinctive color resulting from trace amounts of ch Read More Elodie
17. Nov IGC 2025 Zoisite and its many color The mineral zoisite is a calcium alumosilicate belonging to the class of silicates, more exactly sor Read More Elodie
17. Nov IGC 2025 Padparadscha Sapphire & heat treatment In 2018 the Padparadscha engagement ring of Princess Eugenie (Figure 1), the niece of the king, gave Read More Laurent Cartier
