Sapphire glass never wear

        sapphire glass never wear? Swiss watch brand,, brand watches,, mechanical 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

Deja un comentario