Understanding Your Diamond’s Light Return
The signature aspect of a diamond? Its captivating sparkle. The world’s most famous gemstone has entranced people for thousands of years with its radiant and colorful reflections. This is a diamond’s light return.
Light return is measured in three categories, Optical Brilliance, Fire and Scintillation. Each of these aspects is evaluated on a scale of Poor, Fair, Good, Very Good and Excellent. Diamonds that are graded Excellent in all three of these categories provide the highest levels of light return.
What Makes a Diamond Shine?
It’s a combination of the outstanding physical properties unique to a diamond: its incredible hardness gives it an outstanding luster and ability to shine. Precise faceting lets some diamonds shine brighter and more brilliantly than others. All diamonds start rough—cutting and polishing determines how much one reflects, refracts and releases its inner beauty.
The most true-to-life way of determining the quality of a diamond’s light return is through direct assessment. GCAL and GemEx examine how a diamond appears to the eye and the way each diamond performs in the real world, rather than relying solely on a theoretical model and mathematical analysis. Every shape of diamond can be evaluated this way.
This means that if your diamond comes with a GCAL or GemEx light performance certificate, it was evaluated independently in their lab by expert technicians who capture a series of measurements and analyzed the quantity of light return. These measurements are recorded by the images included on the certificate and the videos on the digital verification webpage.
Each is unique and specific to only one diamond: every image on a GCAL or GemEx certificate is an actual image of that diamond. No generic “sample” photos are ever used.