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Designing the Modern Cut

Image of Reflected light does not enter the diamond.

Reflected light does not enter the diamond.

Image of Transmitted light does enter the diamond

Transmitted light does enter the diamond.

The concept of designing the modern brilliant cut was to formulate an optimum angle, depth and table percentage relationship. The properties that had to be understood to accomplish this task included both transmitted light and reflected light. "Transmitted light" is what enters the diamond and reflected light is what bounces from the surfaces of the diamond.