When people buy a ring, they often have doubts about the letters engraved on the inner wall of the ring, such as Au750. What does this mean? In fact, this Au750 is a description of the material. If there is the word Au750 on the ring, it means that the ring and ring holder of this ring are made of Au750. Au750 is a material commonly used to make jewelry. Although it is a new material, due to its good plasticity and ductility, its performance is more suitable for making jewelry and can be made into various styles.