Turquoise is easy to lose water due to more pores, which makes its luster and color dull, not as beautiful as before. In order to deepen the color of turquoise, people often dip turquoise into wax. Tiêu chuẩn quốc gia GB/T 16552 “Tên của đồ trang sức và ngọc bích” stipulates that the immersion wax of turquoise is not […]
