Most phones using Gorilla Glass top out at a level 6, including the iPhone 7 and Galaxy S8, but the the U Ultra went all the way up to level 8. That’s a sign that it is in fact real sapphire. It’s impressive HTC succeeded where Apple failed, though it should be noted that Apple was thinking about doing this for all iPhone displays, which number in the hundreds of millions. HTC is only doing this for a limited number of U Ultras that will be incredibly expensive.
The price of the HTC U Ultra sapphire edition is about $949, roughly $200 more than the original price of the regular U Ultra before it was discounted. Unfortunately, it’s not being sold in the U.S., which means you’ll have to buy an international version if you want to get your hands on the phone.
Article source: https://www.technobuffalo.com/2017/05/07/htc-u-ultra-sapphire-edition-features-the-strongest-display-ever-on-a-phone/