Sapphire surface wear degree

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www.24onhere.com; wear resistance of sapphire

asked: is it true that the sapphire mirror is never worn out?

www.salehublot.com

answer: this argument is not scientific,www.review4uwatch.com, any material can not never wear, should be " not easy to wear ". At present,www.great2usale.com, the hardness of sapphire is 10 degrees after diamond hardness of 9 degrees, while the average hardness of glass is 5-6 www.salehublot.com

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