Why use sapphire for watch mirror

Synthetic sapphire is one of the hardest objects in all nature, with a Mohs hardness of 9. The hardness of synthetic sapphire is second only to diamond, and maintains its high strength at high temperatures. Synthetic sapphire crystals have good thermal properties, as well as excellent electrical and dielectric properties. In addition, synthetic sapphire combines almost complete resistance to acids and alkaline substances. Sapphires are used in watches because of their resistance, toughness and beautiful appearance.

Why choose sapphire crystal
Synthetic sapphire crystal or "glass" is actually not glass at all. It is a very hard, transparent material made of pure alumina that crystallizes at very high temperatures. sapphire watch glass,Synthetic sapphire has the same hardness as natural sapphire gemstones, but there is no colorant that imparts various tones to the gemstone. When it is heated, the synthetic sapphire is formed into round blocks, which are then cut into pieces with a diamond-coated saw. These discs are then ground and polished into watch crystals. Sapphire (whether natural or synthetic) is one of the hardest substances on earth. Table mirrors made of synthetic sapphire are usually advertised as "scratch-resistant" or "almost scratch-resistant" because they are generally unlikely to be scratched by external forces unless they are deliberately scratched with sharp objects

The sapphire crystal can be glued to most watch cases, or it can be pressed into most plastic glass gaskets. Each sapphire crystal has a slightly polished beveled edge, once installed, the crystal will show a beautiful finished appearance.

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