When jewelers and gemologists talk about the “cut” of the 4Cs, they don’t necessarily mean the shape of a diamond. Diamonds have the brilliant ability to reflect light over and over within their own stones, but for that to happen, the facets must be just so. The number, angle, depth and position of a diamond’s facets may make light leak prematurely through the stone, illuminate it, or show the jewel at its absolute best.
Ideally, a diamond will have flecks of white light, sprinkled with dark spots for contrast and flashes of color where the light has separated into a rainbow. When purchasing a diamond, ask if it has been evaluated by a reputable organization such as the Gemological Institute of America. The report should come with a report about the quality of the cut.