Sapphire mirror is a kind of crystal mirror synthesized by artificial compression. Its advantage is high density and not easy to scratch. The hardness of sapphire glass surface mirror is second only to that of diamond, with a hardness of 2200-2300 Vickers (seven times the hardness of steel) and Mohs hardness of 9. It has good hardness, good luminous permeability, small friction force and high temperature resistance. It should have higher wear resistance than crystal glass mirror and synthetic glass mirror.

The main component of sapphire watch lens is sapphire glass, which is made of sapphire glass after processing and upgrading. The so-called sapphire glass is what we call sapphire. It is synthetic and can be in line with the jewelry industry. Most watch lenses are made of sapphire. It takes the fine and accurate alumina powder as the raw material, and then condenses into crystal blocks in the corresponding high-temperature furnace. After countless times of manual processing, its hardness is quite high, second only to diamond. It is complete with steel. It is made into a surface lens composed of sapphire components. This surface lens can prevent scratching, falling and corrosion. It can also resist strong water pressure when swimming shallow under the water; Sapphire is generally blue. Why is it transparent? It is not sapphire in the traditional sense. It is a kind of crystal glass, which is made manually. In addition to being used on the watch mirror, there are some mobile phone windows that can be used as it.