How is a diamond's cut graded?

A diamond's cut is graded primarily based on proportions, symmetry, and polish, as these factors directly influence the diamond's ability to reflect and refract light, ultimately affecting its brilliance and overall appearance.

Proportions refer to the dimensions of the diamond, such as the depth and table size, which must be well-balanced to achieve optimal light performance. Symmetry assesses how well the diamond's facets align and how evenly they are cut, which is crucial for maximizing the light return. Polish evaluates the smoothness of the diamond's surface, where any imperfections can impact how light interacts with the stone.

Together, these elements create the overall visual appeal and performance of the diamond, making them essential criteria for determining a diamond's cut grade.