How can a diamond be graded as "very good" versus "excellent"?

A diamond's grade of "very good" versus "excellent" is determined primarily by the precision of its cut, symmetry, and polish quality. The cut of a diamond significantly influences its overall appearance, affecting how it reflects light and its brilliance. An "excellent" cut grade indicates that the diamond has superior craftsmanship, achieving optimal proportions and symmetry, which results in maximum light performance.

In contrast, a "very good" cut grade still reflects high quality but does not reach the same level of precision or light performance as an "excellent" grade. The factors of cut precision, symmetry, and polish are assessed using standard grading tools and techniques, making this determination objective and measurable rather than subjective.

While aspects like color and clarity contribute to a diamond's overall grade, they do not determine the distinction between "very good" and "excellent" specifically regarding cut quality. Similarly, market demand and weight or size comparisons are not factors in this aspect of grading, reinforcing the importance of cut characteristics in distinguishing these two levels.