GemEx Diamond Light Performance Certification
A diamond is comprised of many facets that act like mirrors. One of the ways diamonds are beautiful is the way they play with light. The more light a diamond is able to reflect with those facets, the brighter it shines. GemEx uses their patented BrillianceScope to measure how much light is returned to the eye from a diamond. The BrillianceScope takes five measurements that measure white light (brilliance), colored light (fire), and scintillation (sparkle), as well as a view that reveals the craftsmanship and symmetry of the diamond. Only diamonds that measure Very High in brilliance, fire, and sparkle on the GemEx Diamond Light Performance scale are fine enough to be Astor by Blue Nile™ diamonds.