Analysis & Grading

About GIA Facetware®

GIA Facetware® is a free online service that allows you to access GIA's database of more than 38.5 million diamond proportion sets in order to estimate the GIA cut grade for any standard round brilliant diamond in the GIA D-to-Z color range and Flawless-to-I3 clarity range. To estimate a cut grade, use the Facetware calculator to select proportion values such as table size, crown angle, pavilion angle, star length, lower-half (lower-girdle facet) length, and average girdle thickness. Further limitations to the cut grade from girdle minimum and maximum, culet size, polish and symmetry grades, and painting or digging out can be explored.