(1) Diamants: mainly produced in Yimeng Mountain, Shandong and Dalian, Liaoning. Parmi eux, the quality of gem-grade diamonds from Dalian Wafangdian is the best. (2) Saphir: mainly distributed in the eastern coastal areas, such as Hainan, Fujian, Jiangsu, Shandong and Heilongjiang provinces. The storage capacity is considerable, but the color is mostly indigo blue with […]
