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).

Color change sapphires are very interesting gemstones. Like alexandrite, the color appears different depending on the type of light present. Outdoors in sunlight they appear bright blue. Indoors they turn violet like fine amethyst. Other color change combinations exist, such as blue to green.

Color change sapphire is always heat treated to produce, intensify or lighten color and/or improve color uniformity and appearance.

More information on gemstone enhancements.

Color Change Sapphire is a member of the Sapphire gemstone family.