Sapphire glass never wear

        sapphire glass never wear? Swiss watch brand, brand watches,, mechanical watches,tag heuer watches, ultra-thin couples watches, quartz watches,, sapphire watches this statement is not scientific, any matter not probably never wear,, should be " is not easy to wear ". At present the sapphire hardness second only to diamond hardness Mo – 9 degrees 10 degrees, while the ordinary glass hardness of Mo 5-6 degree