- Color: Very rare varieties: yellow, orangey-brown, red, purple, blue, green, grey.
- Hardness: 10
- Refractive index: 2.42
- Density: 3.52
- Chemical composition: C
- Crystal structure: cubic
- Origins: Southern and central Africa, Russia, Canada, Australia, India, Brazil.
Colored diamonds (fancy diamonds) are extremely rare and valuable gems, with intense yellow, red, purple, green or blue hues. Fancy diamonds are often irradiated and heated to intensify their colors.