Sumber daya permata yang kaya di dunia sebagian besar terkonsentrasi di Afrika, Asia, Amerika dan Oseania. 1. Africa The African continent is rich in gem resources and is known as the “World Gem Warehouse”. It is rich in diamonds, Rubi, safir, zamrud emas, zamrud, aquamarine, kecubung, peridot and turquoise, among which diamonds are the most […]
