Four times harder than regular glass, phone manufacturers have been talking about using sapphire glass as a replacement for Gorilla Glass, on a smartphone's display. But some manufacturers say that the time is not right for such a switch. Sure, to scratch sapphire glass, you would need a diamond, or some other material that rates a "10" on the hardness scale. Gorilla Glass is ranked as a "7" on the test. But there is more to look at besides a material's resistance to scratching. The pricing of a material is also important.While sapphire glass is very expensive, Apple does use the material ...
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