Because of each country's product availability, the selection on this site may not be the same as the one you were previously on.Confirm Cancel
You're Already An InsiderThanks for being a Blue Nile fan. Keep an eye on your inbox for exclusive news and offers.
Diamond Cut Grading
GIA Cut Grading Criteria
AGSL Cut Grading Criteria
Blue Nile Diamond Cut
If a GIA or AGSL certified cut grade is not available for a particular diamond, Blue Nile's proportional grading system will determine the diamond's cut.
Blue Nile uses the measurements from each diamond's grading report to determine:
Blue Nile Cut Standards
Based on criteria listed on both grading reports: