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Why Light Performance?

The way a diamond reflects and refracts light determines its beauty. GemEx measures the play of light in a diamond to determine its Light Performance.

Light Performance is broken down into 3 types of light return.

White light is commonly referred to as brilliance. The BrillianceScope Analyzer measures the percentage of the diamond returning bright white light to the observer.

Color light is commonly referred to as fire. The BrillianceScope Analyzer measures the percentage of the diamond returning bright color light to the observer.

“Scintillation is the term used for changing colours, the radiance and sparkle of the rays when the stone is moved or when the light source changes.” (Diamond Grading ABC, Varena Pagel-Theisen) The BrillianceScope Analyzer measures the number of light points and determines how they change from position to position.

The “Return of Light” analysis for any diamond is based on a scale which compares the three components of light performance for that diamond to standards established for diamonds with the same shape.


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