Fun fact: sapphire and ruby are the same thing. Al2O2: Aluminum Oxide in the crystal form corundum. Chromium impurities create a red tint hence ruby. Iron apparently creates blue tints.
http://en.wikipedia.org/wiki/Sapphire
Another fun fact: Apparently, artificial sapphire is used on the home button on the iPhone 5s and up. It's to prevent it from being scratched.
Fact is true. If you stratch a finger print scanner it wouldn't work. It's also used to supplement the screens, cover the camera, and used as the face of the apple watch,
http://en.wikipedia.org/wiki/Sapphire
Another fun fact: Apparently, artificial sapphire is used on the home button on the iPhone 5s and up. It's to prevent it from being scratched.
"There minerals marie!"