AGS Cut Grade Chart

This page shows the diamond cut grade chart based on AGS (American Gem Society) standards. Diamond cut grading is standardized by both GIA (Gemological Institute of America) and AGS. GIA diamond cut grading is based on girdle thickness, finish and culet size. AGS cut grade chart displayed here is based on light quality, proportion, and finish of the diamond. Feel free to make use of this chart to ensure the quality of diamond you before purchase.

Diamond Cut Grade Chart

Cut Scale
AGS
0AGS Ideal
1AGS Excellent
2AGS Very Good
3AGS Good
4
5AGS Fair
6
7
8AGS Poor
9
10

AGS (American Gem Society) and GIA (Gemological Institute of America) have different standards for diamond cut grading which have only a very little difference in their scales. This AGS cut grade chart rates the diamond from ideal to poor.


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