Colorless to yellow, brown, orange, blue, green, pink, black. Most diamonds are slightly yellowish, and in this general color range, those most approaching absolute lack of color are most prized. However, brightly colored diamonds are much rarer and more expensive.

 The deep blue Hope diamond and blue Eugenie diamond, both in the Smithsonian collection, are among the most famous examples. The rarest and most highly prized color is a deep pink to red.

 The major sources include southern Africa, Australia, and Siberia. In North America, the best known source is at Murfreesboro, Arkansas, although it has not been commercially developed. Significant deposits have been found recently in Canada.