9.0 on the Mohs scale.
Myanmar (Burma), Thailand, India, Sri Lanka (Ceylon), Tanzania, Afghanistan, Australia, Brazil, Cambodia, Malagasy Republic, Malawi, Pakistan, Zimbabwe (Rhodesia), United States (Montana, North Carolina).
The greenish varieties of corundum are called green sapphire. Green sapphire is fairly common and not as valuable as other colors.
Green sapphire is always heat treated to produce, intensify or lighten color and/or improve color uniformity and appearance.
More information on gemstone enhancements.
Green Sapphire is a member of the Sapphire gemstone family.
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