While Apple claims to have Sapphire crystal lens cover on their iPhone's, they get scratched on level 6-7 on Mohs scale of hardness, compared to a proper Sapphire crystal like the one on the Tissot watch gets scratched on level 8 as shown in the video shared below.

Gorilla Glass, the current uncontested and undisputed leader in making tough glasses to secure your expensive smartphones and tablets might soon loose the title. A better much stronger, unbreakable and unscratchable glass made from the second hardest material after diamond - Sapphire, is already being used to cover the Camera lens of iPhone and should soon be used to cover full body of gizmos as costs come down with mass production.