Xu Lun: It is the correct meaning. As can be seen from the name, it has a high position in the stone tablet amulet. Chinese medicine believes that Xulun has the functions of calming the nerves, beautifying, losing weight, eliminating damp heat and eliminating all toxic sores. Xulun is actually the stomach stone of sharks, because the ancients thought that sharks can eat evil spirits and have the ability to ward off evil spirits, while Xulun is an undigested crystal in the shark's stomach, which the ancients thought was the condensation of the shark's soul. It is often used as a stone tablet amulet for blessing. The surface of a high-quality beard has a smooth and delicate gem luster. Under the reflection of light, it can present colorful colors like abalone shells.