The rich gem resources in the world are mainly concentrated in Africa, Asia, America and Oceania. 1. Africa The African continent is rich in gem resources and is known as the “World Gem Warehouse”. It is rich in diamonds, 루비, 사파이어, golden emeralds, 에메랄드, 남옥, 자수정, peridot and turquoise, among which diamonds are the most […]
