A diamond's finish consists of symmetry and what other factor?

The correct answer is polish because a diamond's finish is evaluated based on both symmetry and polish. Symmetry refers to the precise alignment and proportions of the diamond's facets, which affect how light reflects and refracts within the stone, contributing to its overall appearance. Polish, on the other hand, relates to the smoothness and quality of the diamond's surface after it has been cut. A well-polished diamond enhances the stone's brilliance by allowing light to enter and exit the gem more effectively. Together, these two factors—symmetry and polish—comprise the overall finish of a diamond, impacting its visual appeal and quality significantly.

Other factors such as clarity, which refers to the presence of inclusions or blemishes, and weight, which is a measure of size, do not relate to the finish of the diamond directly, making them irrelevant in this context. Thus, polish is essential when assessing the overall finish alongside symmetry.