Say goodbye to those chintzy smartphone screen protectors; Apple could be on track to use scratch-proof sapphire crystal in its next iPhone.

A report by 9to5Mac suggests that Apple could produce 100 million to 200 million smartphone-sized displays per year in a new Arizona manufacturing plant. Apple is working with New Hampshire-based GT Advanced Technologies to operate the plant, and documents show that GT has received hundreds of furnace and chamber systems for producing “boules” of sapphire crystal. With further processing and polishing, these boules can become screen-sized sheets of sapphire.

Although Apple already uses sapphire for iPhone camera lens covers and the TouchID fingerprint sensor in the iPhone 5s, inspection tools ordered by GT are clearly designated for screen cover materials. 9to5Mac claims that we could see this technology in the next iPhone.

Being the second-hardest natural material behind diamond, sapphire has gotten a lot of hype as…