Sapphire is a gemstone. It is made up of a variety of mineral corundum and aluminium oxide.
The color of sapphires is normally blue but there are natural sapphires that are colors of yellow, purple, orange and green. Sapphires can not be red as they would be rubies then. Pink colored corundum may be ruby or sapphire.
Sapphires are cut and polished into gemstones and worn as jewelry. These gems may also be created in laboratories for industrial or decorative purposes. Sapphires are the third hardest mineral only succeded by diamonds and moissanite. Sapphires are also used in wristwatch crystals, high durability windows and electronic wafers that help insulate.
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