Evaluating the ASET Image

The ASET devices allow us to analyze the Light Performance of a diamond by color-coding the image using the colors RED, GREEN, BLUE, and BLACK (or WHITE).  By understanding what the colors mean, and how they are distributed, one can easily understand how efficiently, or inefficiently, a diamond is using light.

Red represents the brightest light that helps to make the diamond brilliant! It strikes the diamond from 45 degrees up to perpendicular to the table.

Green represents light that is not as bright. It has been reflected off of objects or it strikes the diamond from indirect angles. This is light that strikes the diamond from 45 degrees out to the horizon.

Ideally, we want to see much more red than green. However, the table reflection area in the very center might appear red, green, or occasionally a combination of both.

Blue represents Contrast, which is the pattern of light and dark areas that our eye finds pleasing. It is caused by light that is blocked by the viewer’s head. Contrast should be distributed in a balanced & symmetrical pattern.

Black represents Leakage which is an area from which light literally leaks out of the diamond and is lost. There should be very little of this.

Actual diamonds as seen in a Presentation ASET:

High Light Performance:

Light Performance Grade: 0        Light Performance Grade: 1        Light Performance Grade: 2

Medium Light Performance:

Light Performance Grade: 3        Light Performance Grade: 4        Light Performance Grade: 5

Low Light Performance:

Light Performance Grade: 8        Light Performance Grade: 9        Light Performance Grade: 10

Princess Cut Examples:

Light Performance Grade: 1        Light Performance Grade: 2        Light Performance Grade: 3