Cut, the arrangement of a diamond's facets, is one of the most important of all characteristics, and among the hardest to judge. A diamond's shape is not to be confused with its cut. The proportions of a stone, symmetry, polish, and precision of faceting determine how much of the diamond’s potential fire and beauty may be released, its perceived size and even, its apparent color. Percentages for depth, height and angles are also important. Light should enter and exit a diamond through the top facets. A cut that is too shallow or too deep reflects it through the bottom facets, and lets the light “leak” out of the bottom or side of the stone.

All other factors being equal, a poorly cut diamond can value far less than a well cut or ideal cut stone. Diamond cutters are paid to retain the maximum weight from rough stones. Extremely poor cut diamonds such as long, fat, or deep stones tend to result in a higher yield (less waste) from the rough while a better made diamond “wastes” more of the rough. This is why better cut diamonds and near ideal cut stones command a premium. Read More...

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