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Because the Sapphire Crystal on watch face is not natural, but is made of Alumina powder and shaped into Sapphire Crystal Block in the high temperature furnace. Although sapphire is scratch-resistant and anti-corrosive, its hardness is also second only to diamond and is about seven times of steel, it is not never be worn. It can also get scratched when frictioning with Diamond, Millstone, Sandpaper, Nail File, Granite surface and Concrete wall.
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