What's the stronger protecting layer, corning 'Gorilla' glass from smartphones or sapphire crystal used in watches? Why doesn't one use the other? - Quora
Corning's stronger Gorilla Glass 5 is hitting devices later this year | TechCrunch
102 Corning Gorilla Glass Screen Protetor for iPhone 6(S)/6(S) Plus | Zoarah
PET, TPU, or Tempered Glass – all you need to know to choose a screen protector - PhoneArena