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Light Return is also known as brilliance or total brightness. It’s the exceptional way diamonds reflect and refract light creating a luminous return of light to a viewer’s eye that has made diamonds sought after for centuries. Gemprint’s Light Performance technology captures and measures the actual output of light from a diamond. The Gemprint instrument shines a single beam of light (a red laser) into a diamond and analyzes the light coming back out of the diamond. First, data is captured by directing the light beam directly perpendicularly into the diamond, and then the instrument directs the light beam at the diamond while it is tilted approximately 12-14 degrees in eight different directions to establish the light return from different angles.
The data is compiled, analyzed, and graded on a scale of Fair, Good, Very Good, and Excellent.
The white reflections in the optical brilliance images represent reflections of light. The more reflections and the more the symmetry of the reflections the better the optical brilliance and the brighter the diamond.