Kevin bullis, MIT Technology Review:
Manufactured sapphireâ€”a material thatâ€™s used as transparent armor on military vehiclesâ€”could become cheap enough to replace the glass display covers on mobile phones. That could mean smartphone screens that donâ€™t crack when you drop them and canâ€™t be scratched with keys, or even by a concrete sidewalk.
Among natural materials only diamonds are harder than sapphire. Compared to Gorilla Glass sapphire is roughly 3x stronger and 3x more scratch resistant.