Specifically, it is designed, cut and polished. If diamonds are not cut and polished, how different are they from glass? The beauty of diamond, the luster of diamond and the fire color of diamond all need to be cut and polished to fully reflect. Only by designing the incident angle, refraction angle and reflection angle of light perfectly can diamonds emit and refract light to the most ideal state through cutting and polishing. Therefore, the beauty of diamonds, to a great extent, is the perfect combination of natural beauty and artificial beauty.

There is an old saying in China that "jade must be cut and abrasive must be cut", which is the reason.