sapphire glass has been used on camera lenses, expensive watches and, for years, on the screens of Vertu's handmade phones. Starting with the iPhone 6, it is also used to cover the phone's camera ...

Anyone shopping for an Apple Watch ... on a Series device was stainless steel. Stainless steel models are significantly more expensive but offer a more durable build and feature a sapphire crystal ...

Ever since Apple started ... yet to see sapphire cover anything but the iPhone's camera lens and the iPhone 5s' Touch ID home button, but that could all change with the iPhone 6.