Original plans called for a sapphire display on both new Apple iPhone 6 models
The sources added that the fault lies with Biel and Lens Technologies, the company charged with turning the sapphire material into sapphire glass screens. The whole affair wasn't a total loss for Apple, as the sapphire glass that didn't pass QC were turned into screens for the Apple Watch. The report says that Apple will move the rest of the sapphire glass production for the Apple Watch back to Arizona, where sapphire will continue to be produced, possibly for later iPhone 6 units.
The good news here is that GT has shown that it can meet Apple's production requirements, which was a big concern. And according to the report, Biel and Lens' finishing yield issues can be resolved. Eventually, Apple will offer iPhone models using a sapphire glass screen. It all depends on getting the finishing yields up to a rate that makes using the sapphire glass less expensive for Apple to use.
source: WallStreetForensics via BGR