LIGHT PERFORMANCE

The American Gem Society Lab defines Light Performance of a diamond as an analysis of:

• Brightness - The amount of white light in a diamond returned to the observer.
• Dispersion - The separation of white light into colors by refraction.
• Leakage - Areas that do not return light in a diamond.
• Contrast - The light and dark patterns seen when observing a faceted diamond. It can be positive or negative in its optical effect. Usually caused by, but not limited to, the observer’s head.