Sapphire single crystals can be made into optical elements for experiments, such as lenses, prisms and mirrors, because of their ideal optical and mechanical properties, as well as detection instruments for scientific research, such as gravitational wave detection instruments. With a sapphire crystal band, high transmittance, high strength, high temperature resistance, abrasion resistance, corrosion resistance, and the observation window detection window and can be used as equipment and instruments in a variety of high temperature and high pressure under harsh environment, coal, gas, oil well corrosion detection sensor and detector window etc.. In other civilian aspects, sapphire can also be used as a medical surgical tool, a precision instrument shell, a precision mechanical bearing, and a high-grade watch and jewelry. There are a variety of cup appliances, lamps and transparent visors etc..