Diamonds range from colourless to black, and so they is also clear, translucent, or opaque. Such a lot diamonds used as gems are clear and colourless or just about so. Colourless or pale blue stones are Such a lot valued, however these are rare; Such a lot gem diamonds are tinged with yellow. A “fancy” diamond has a definite body colour; red, blue, and green are rarest, and orange, violet, yellow, and yellowish green more not unusual. Such a lot industrial diamonds are grey or brown and are translucent or opaque, however better-quality industrial stones grade imperceptibly into poor quality gems.