I believe that Gorilla Glass 5 makes it unlikely that a sapphire smartphone screen of any type will ever gain traction. This product from Corning pretty much makes a need for it less likely
Sapphire glass is produced by mixing aluminium oxide, a “sapphire seed” and uncrystallised sapphire and placing it in a furnace. The materials are then heated to 2200°C, left to cool for
Gorilla Glass Victus unveiled: survives 2m drops and has twice the scratch resistance Counterclockwise: the rise of Gorilla Glass and how it changed the phone industry Reader comments

Some people 'just don't want to see' the difference between sapphire and gorilla glass. Amazon also sells scratch-resistant tempered glass screen protectors at very cheap prices. And I did a search and found that AR coated sapphires can be scratched. It was easy to see posts about scratched sapphires in the luxury watch community.

February 9, 2015. GT Advanced is out of the sapphire biz, but that does not mean rival Corning will be resting on its laurels. The company announced recently that it is prepping a "sapphire-like
In the video above, you can see the relative toughness/scratch resistance of sapphire vs. Gorilla Glass. By comparison, the same piece of Gorilla Glass costs $3. In the video above, GT says The wonderful thing about plastic and glass crystals is the fact that they can be custom cut, shaped, or trimmed to fit different watch cases. Typically in the luxury watch field, sapphire crystals are preferred. Sapphire is extremely strong and scratch resistant – making it the top choice for a fine timepiece.

Corning Glass senior vice president Tony Tripeny spoke critically of sapphire as a material for displays during a question and answer session at the recent Morgan Stanley Technology, Media & Telecom Conference (Via Seeking Alpha and CNET). His responses reiterate the company's earlier opposition

Meanwhile, Gorilla Glass, Dragontrail Glass, and tempered glass get scratched with materials at level six on the Mohs scale. So expect sapphire-clad devices to fare better in your purse or
nEOa.
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    • gorilla glass 3 vs sapphire