7.If the cut is too deep or too shallow light will spill through the side or bottom and be lost, resulting in a less brilliant display and thus, a less valuable diamond.
8.To make it simple, the larger the diamond, the rarer it is (carat weight); the purer the diamond, the more valuable it is (clarity); the less color in a diamond, the more beautiful; and the more precise the cut of the diamond, the more brilliant it is.