Zhuoyu

China has a wise saying that "stones from other mountains can attack jade", which shows the true meaning of cutting jade. As a matter of fact, the jade that excels in nature is not carved, but is grinded into the designed finished product by using emery, Shi Ying, garnet and other "jade-solving sands" with hardness higher than that of jade, supplemented by water. Therefore, in jargon, making jade is not called carving jade, but treating jade, or cutting jade, grinding jade and grinding jade. The skill of cutting jade is superb, but the tools for treating jade are crude. Until modern times, China people have been using traditional tools, such as wire saws, disks made of steel and wrought iron, round wheels, drilling machines, semi-disks and wooden lathes to make jade articles. In the Neolithic Age and Bronze Age before the invention of iron, most tools were even made of wood and bamboo, bone and sandstone. It's a miracle that such a primitive tool can work out such wonderful jade articles.
Reprinted with attribution： https://cnlocality.com/(Chinese Specialty Products)