But loose diamond are distinctly different from theirs close cousins the common mineral graphite and lonsdaleite, both of which are also composed of carbon.
Usually the diamonds rough will be cut into whichever shape that requires the least amount of sacrifice. Marquise and oval shapes should have a length thats exactly twice the size of the width. If they are too narrow or too wide, the stone will loose light and appear too dark.
Every copper wire in your computer, television, and house has been shaped with a die made from diamonds.