What is sapphire display?

Apple's new coming flagship smartphone iPhone 6 could be packed with so called Sapphire display. But what is sapphire display????
Simply a display which is made up of sapphire is known as sapphire display. Apple is believed to be producing its own displays for the iPhone 6 made of sapphire; however, several analysts suggest that not all models of the new iPhone 6 will have the new displays.

It’s about 10 times more expensive. It’s about 1.6 times heavier. It’s environmentally unfriendly. It takes about 100 times more energy to generate a sapphire crystal than it does glass. It transmits less light which it means either dimmer devices or shorter battery life. It continues to break. I think while it’s scratch resistant product it still breaks and our testing says that Gorilla Glass, about 2.5 times more pressure that it can take than Sapphire on. So when we look at it, we think from an overall industry and trend that is not attractive in consumer electronics.

As for advantages, sapphire glass may be “a little more scratch resistant” than Gorilla Glass. Also of importance for Corning, from a marketing point of view is the “sexy name” of sapphire.

“Corning is really good about frequent updates and full disclosure and every time Corning’s been asked about this sapphire issue, you have extolled the virtues of Gorilla Glass and all the problems with sapphire,” one unnamed analyst said, asking whether sapphire glass adoption will have any negative impact on Corning’s business.
The displays of older iPhones are made of Corning  Gorilla Glass. However, Apple is now taking an increasing number of steps toward self-sufficiency and relies less on third-party suppliers to make its device components. Earlier this year, Apple announced plans to build a sapphire manufacturing facility in Mesa, Arizona, and it filed a sapphire-related patent with the U.S. Patent and Trademark Office; these reports fueled rumors that the iPhone 6 would have a sapphire screen.