Corundum, and the red ones are called rubies and they call all the other colors sapphire (blue, pink, clear, orange, etc) when clearly the pink ones at least should also be rubies.
Want your mind blown?
Cabbage, broccoli, and cauliflower are ALL THE SAME SPECIES OF PLANT.
Nah I know, that doesn’t bother me cause like chihuahuas and huskies are both dogs
Thoughts From The Peacock Angel 