Diamond appraisals in Houston provided by Bob and Mark Sandler, certified gemologists.

In order to grade a mounted diamond for performance, according to AGS Standards, we use the Angular Spectrum Evaluation Tool (ASET®) and ASET® Image Comparison Charts to assess performance. 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.

RED: Light collected from the optimal angles. The light which diamond uses most effectively. It represents brightness and optical efficiency.

GREEN: Light collected from less than optimal angles and which is less efficient.

BLUE: Represents "Contrast" or "Optical Texture". Caused by light being obscured by the viewer's head and torso & creates light and dark areas. Demonstrates balance & symmetry.

BLACK: (or White, depending upon which ASET too is used): This represents "Leakage", light that is literally lost.*

The ASET® Image Comparison Charts are listed below for high, medium and low performance.

* Content and Charts provided by American Gem Society (www.americangemsociety.org)

We would love to hear from you!

Designer Jewels, Inc. is Houston's fine jewelry designer providing jewelry appraisal services, custom design and repair. We also buy and sell old estate jewelry.