Sapphire lenses are also very common in daily life. In addition to the sapphire watch mirror industry, they are also used in some fields such as mobile phone panels, fingerprint lock protection sheets, and fingerprint lock display panels, indicating their widespread use.

The reason why sapphire watch lenses are so popular in the watch lens industry is due to their high strength and hardness, with other features being secondary. The transmittance range of such a watch mirror can extend from ultraviolet to mid infrared wavelength range, and few high hardness substances can scratch it. Even uncoated sapphire has excellent surface hardness, and there are few materials that can scratch it, making it less prone to damage due to collision or scratching.