CUT
The Cut is the most objective and scientific measurement of a diamond’s proportions, arrangement and alignment of the facets, and quality of the polish. In an ideally cut stone, the light entering the diamond reflects and refracts creating the fire, brilliance, and scintillation (“sparkle”) in the stone. The Cut is a result of the artistry and craftsmanship of the diamond cutter, to maximize the return of light.
CUT VS SHAPE
Of the 4 Cs, the "Cut" is the most crucial component to a particular stone’s overall beauty. The Cut should not be confused with the “shape” of a diamond. The Cut is only measured for Round Brilliant diamonds. All other shapes do not receive a “Cut” grade, but rather a polish and symmetry grade. The “Cut” is therefore more subjective for these shapes, and the beauty of the stone is more subject to the overall “look” that the client is trying to achieve.
