17. Nov IGC 2025 Modern Cultivation of Freshwater Pearls in China: Advances in Materials, Technique Niels Ruddy Hansen Download Pdf Pearl
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
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 Historic Emeralds and their Geographic Origin: A Retrospective Study When it comes to the geographic origin of gems, curiously enough, historians sometimes put forward p Read More Elodie
