About Diamond Cuts : Diamond Education
Cut refers to the proportions and finish created when transforming a rough diamond into a polished diamond. Of the four C's, cut has the most influence on a diamond's brilliance, radiance and beauty. Round is the most brilliant shape, and also has the most demanding cutting standards. When a diamond has been cut to ideal proportions by a master cutter, it will refract light internally from one facet to another and release the light through the top.