Os ricos recursos de gemas do mundo estão concentrados principalmente na África, Ásia, América e Oceania. 1. Africa The African continent is rich in gem resources and is known as the "World Gem Warehouse". It is rich in diamonds, rubis, safiras, esmeraldas douradas, esmeraldas, AQUAMARINE, ametista, peridot and turquoise, among which diamonds are the most [...]
