Ceylon Natural Colour Change Sapphire

A rare variety of natural sapphire, known as color-change sapphire, exhibits different colors in different light. Color change sapphires are blue in outdoor light and purple under incandescent indoor light. Color change sapphires come from a variety of locations are mostly  Thailand, Sri Lanka and Tanzania. The color-change effect is caused by the interaction of the sapphire, which absorbs specific wavelengths of light, and the light-source, whose spectral output varies depending upon the illuminant. Transition-metal impurities in the sapphire, such as chromium and vanadium, are responsible for the color change.

Sapphire is a precious gemstone, a variety of the mineral corundum, an aluminium oxide.

Color: Blue, Green, Purple, Black, Yellow, Pink, White, Grey, Brown, Orange

Luster: Vitreous, Adamantine

Birthstone zodiac sign: Virgo

Associated month: September

Crystal system: Hexagonal crystal system

Chemical formula: Al₂O₃

Hardness (Mohs hardness scale): 9