IGI explains diamond light performance components

The way light behaves within a diamond determines the brightness, fire, contrast and scintillation a viewer will see when lighting is conducive. Learn how these terms are defined by IGI, and what causes us to see the different components of diamond light performance.

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Glad to have found this educational video. It's very useful when I'm looking for a diamond for a proposal. I noticed that the GIA certificate doesn't mention anything about the light performance, which is quite disappointing. It's sad that everyone only focuses on the 4C's. I believe IGI deserves to be more widely accepted for consumer diamonds.