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What coning is scared of?Sapphire screen---a better choice t

What is coning scared of?Sapphire screen---a better choice than Gorilla Glass
Along with APPLE'S cooperate with GTAT more and more samrtphone manufactor had focused on the sapphire screen.Apple watch has used sapphire screen and it is said that the next IPHONE will adopt sapphire screen.Inorder to remain competitive in smartphone SAMSUNG、LG、Kyocera、Xiaomi  has already take actions.
But why apple abandon the Gorilla Glass and what sapphire screen is better than Gorilla Glass?
1.About the hardness On the Mohs scale of hardness, Gorilla Glass scores a 6.8, which puts it just below a mineral like Quartz. Sapphire is the second hardest naturally occurring material on the planet, behind diamond. and scores 9 on the Mohs scale of mineral hardness. This test matches one substance's ability to scratch another - and so is a better indicator of scratch resistance than shatter resistance.“Chemically strengthened glass can be excellent, but sapphire is better in terms of hardness, strength, and toughness,” said Matthew Hall, Director of the Center for Advanced Ceramic Technology at the Kazuo Inamori School of Engineering at Alfred University, quoted in Tech Crunch. “The fracture toughness of sapphire should be around 4 times greater than Gorilla Glass – about 3 MPa-m0.5 versus 0.7 MPa-m0.5, respectively.”
2.About the cost。Currently sapphire is more expensive to produce than Gorilla glass, but how much more depends on who you ask. Corning claims that a sapphire display is about 10x the cost of an equivalent Gorilla Glass display, but GT Advanced Technologies says sapphire is currently about 3-4 times more expensive to produce.
But Apple has paid GT Advanced Technologies $578 million up front to build a plant in Arizona to produce sapphire exclusively for its products. Estimates put the production capacity at up to 200 million displays a year - a volume which would inevitable reduce the unit price of sapphire still further.
There are other cost benefits that going sapphire brings over and above the unit cost, for instance the reduced cost of replacing screens on iPhones broken under warranty or Apple Care protection. And, naturally, being the only phone (barring the $11,000 Vertue) with sapphire display technology is a genuine unique selling point with real competitive advantage.