Performance Grading
The AGS ASET provides a quick and easy — yet sophisticated — way to assess a diamond’s interaction with light. The name ASET stands for Angular Spectrum Evaluation Tool, and the device was developed to be used with the performance-based American Gem Society Diamond Cut Grading System. The tool’s design and the procedures for using it are simple. However, the results reflect one of the most important discoveries to come from the research for the current performance-based system.
Evaluating the ASET Image
The ASET image provides a quick and easy way to assess a diamond’s interaction with light. It’s brightness, leakage, and contrast can be evaluated by noting the pattern and amount of red, blue, green, and black. Thus, the ASET image provides a reasonably effective way to analyze Light Performance when more precise methods cannot be used.
To evaluate the ASET Image:
- Look at the diamond carefully, and compare its appearance to the illustrations in the ASET Image Charts.
- Using the chart illustrations as a guide, select the appropriate comment to describe the overall level of light performance shown in the ASET image:
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