As we count down the days until Apple's (NASDAQ:AAPL) 2014 Worldwide Developers Conference in June, speculation continues to swirl regarding which material will serve as the protective cover of choice on Apple's future iPhones.

On one hand, there's Corning's (NYSE:GLW) Gorilla Glass, which has maintained a spot covering Apple's iPhones for years. On the other hand, GT Advanced Technologies' (NASDAQ: GTAT) relative newcomer in sapphire notably boasts amazing scratch resistant properties.

However, according to the Fool's Steve Symington in the following video, Apple could be planning a way to incorporate both Corning's Gorilla Glass and GTAT's sapphire into a single display cover to combine the best of both worlds. The catch? If it does happen, recent comments from GTAT management indicate it almost certainly wouldn't be ready for Apple's presumed fall 2014 launch of the iPhone 6.

To hear Steve's full take, watch the following video.