Although it is one of the world precious minerals (32 อ่าน)
Although it is one of the world's precious minerals But China still needs high quality gemstones from around the world. such as rubies and a wide variety of sapphires in virtually all sizes and shapes. Both small gemstones 0.7–3.5 mm in diameter , as well as standard gems 3 x 4 mm and 6 x 8 mm, and the demand for high-quality smaller gems such as sapphires and rubies, ranging in size from one to two carats, has increased dramatically. continuously This shows that the Chinese market is growing steadily. especially in Beijing and Shanghai.