GIA assigns 5 “cut” grades to finished round brilliant cut diamonds, which are:
Excellent, Very Good, Good, Fair and Poor. Only “round – brilliant cut diamonds” receive a “Cut” grade from GIA, due to their symmetry and specific cut ratio formula, to unlock the most amount of fire and light dispersion. All other “fancy shapes” receive “polish” and “symmetry” grades from GIA but not “Cut” grades, due to their unique shapes and varying degrees of personal attributes in the eye of the beholder.
If you’d like to learn more about the different diamond shapes, please review our diamond shapes page.