8.0 on the Mohs scale.
Myanmar (Burma), Madagascar, Pakistan, Australia, Italy, Sri Lanka (Ceylon), Afghanistan, Brazil, Sweden, Turkey, former USSR, and the U.S.. Often found alongside corundum.
The name may be derived from the Latin word spinella, meaning "little thorn", possibly referring to the fact that some spinel crystals are found with sharp points. Spinel is almost a secret among gem lovers. It's hardness of 8, and lack of cleavage makes for a tough and durable gemstone. It mimics corundum, and crystals are found in a wide spectrum of colors, including red, orange, yellow, dark green, blue, purple, brown and black.
Spinel is not enhanced.
More information on gemstone enhancements.
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