Performance Cut Grade System

The AGS Performance-Based Cut Grading System takes advantage of revolutionary hardware and software in considering a diamond's performance, especially as it relates to diamond cut.

• The diamonds are first measured using a computerized measuring device, which also creates a three-dimensional model.
• The diamond grader imports the information into the AGS ray-tracing software and receives values for proportions and light performance.
• The diamond grader then analyzes the girdle, the culet, the symmetry, and the polish characteristics of the diamond.

All form the three elements to the final diamond Cut Grade - Light Performance, Proportion Factors, and Finish, giving you a more thoroughly analyzed diamond, which in turn helps you make a more informed buying decision.

As an indication of the level of thoroughness of the AGS Performance-Based Cut Grade, each category takes into consideration the following 11 factors — definitions for these terms and others can be found on the Glossary page.

Light Performance Brightness Dispersion (Fire) Leakage Contrast

Proportion Factors Girdle Thickness Culet Size Weight Ratio Durability Tilt

Finish Polish Symmetry

To learn more about the AGS Cut Grading System, view any of the following topics:
The AGS 0-10 Grading System
Diamond Cut Grade
Diamond Color Grade
Diamond Clarity Grade
Glossary
Research and Technology