For grading purposes, the word "cut" means the proportions and finish - or make - of a polished diamond. Proportions are the agnels and relative measurements of a polished gem's facets and the relationships between them. Finish is the quality of the polish and the precision or symmetry of the cut. These factors, along with the thickness of the girdle, affect a diamond's overall cut grade.

Cut Grade

The cut-grading system developed and used by GIA applies to standard round brilliant diamonds in all clarities across the D-to-Z color range. It assigns one of five cut grades: Excellent, Very Good, Good, Fair, and Poor.

Round Brilliant Cut, Proportion

A well-cut diamond can make light perform in breathtaking ways, resulting in a magnificent display of three important diamond attributes: brilliance, fire, and scintillation.


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