Diamonds are rigorously graded according to the Four Cs: cut, color, clarity, and carat. In our opinion, the cut of the diamond is the most important.
Two diamonds could be totally equal in color, clarity, and carat but completely different qualities (and prices) as a result of their cuts. The only of the Four Cs that isn’t set in stone, a diamond’s cut is determined by three factors:
Precision: This refers to the diamond’s proportions—the angles that maximize the light performance of a given stone. Diamonds with a larger face-up size aren’t necessarily cut the most precisely.
Symmetry: When a diamond has excellent symmetry, this means that the facets of the diamond are perfectly aligned.
Polish: A diamond’s polish refers to the quality of the facet surfaces. The better the polish, the better the diamond reflects light