The term cut is used to describe the accuracy of the angles and proportions of the facets of a polished diamond, compared against a set of ideal measurements. This accuracy governs the interaction between the diamond and light, greatly determining the diamond’s overall appearance. Put simply, more accuracy equals greater brilliance.
Cut is the only one of the four C’s that is influenced by man. Every gem-quality diamond in the world has been carefully cleaved, cut and polished by hand using experienced eyes and traditional techniques.