Cut is perhaps the most important of the four C's. It is the cut of a diamond that releases its brilliance. Color is graded Excellent, Very Good, Good, Fair, or Poor.
A well-cut H, SI stone will look better than a poorly cut E, VVS stone when they are placed together. The facets are what create the sparkle and scintillation of a diamond, assuming that the color and clarity are of a responsible grade, i.e. not industrial or commercial grade.
Just as color and clarity have a grading system, so does cut. In 1919, Marcel Tolkowsky calculated proportions that have become the benchmark for cutting round, brilliant diamonds called the "Ideal Cut" or "American Cut Ideal Brilliant."
Quick FAQs About Cut