Jet is a precious and rare natural resource, which is produced in Hotan County, Xinjiang Uygur Autonomous Region. Thick color, greasy texture, black as ink, bright and lovely, famous. Its hardness is about Mohs4o, and it is known as a precious material for processing inkstones and knives. The ancients called it "gem" together with diamonds, precious stones and hetian jade. Black jade refers to a valuable variety of Hetian jade, which has the excellent quality of Hetian jade and is compact and moist. Among them, pure black jade is as black as ink, thick and greasy in color, delicate in texture, smooth and elegant.
Jet is a variety of Hetian jade. Although it is not as famous as white jade, it is also very precious because of its scarce output, low-key color and scarce market. In fact, jet with good quality is rich in color and greasy, and also has unique beauty, exquisiteness and preciousness.