Green Sapphire Precious StoneHardness: 9.0Occurrence: Myanmar (Burma), Thailand, India, Sri Lanka (Ceylon), Tanzania, Afghanistan, Australia, Brazil, Cambodia, Malagasy Republic, Malawi, Pakistan, Zimbabwe (Rhodesia), United States (Montana, North Carolina)Appearance: The greenish varieties of corundum are called green sapphire. Green sapphire is fairly common and not as valuable as other colors.Enhancements: Green sapphire is always heat treated to produce, intensify or lighten color and/or improve color uniformity and appearance