Ngọc Sơn, namely Dushan jade. It is a very common gem in the Chinese jewelry market, named after it was produced in Dushan County, Nanyang, Hà Nam, Trung Quốc. Từ thời cổ đại, it has been one of the gems that people love. Duyu is a multi-color jade, which can be subdivided into more than 20 màu sắc, Nhưng […]
