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Diamond Design and Light Performance

 

Basic Diamond Design and Light Performance analysis using reverse ray tracing.

Analyze the properties of the Ideal Round Brilliant Cut that make it the best.

Figure 3.

Most everyone learning about diamonds and their cutting has seen ray tracing like that shown in Figure 3. For more than 80 years these ray trace diagrams have been used to graphically explain to the consumer the superior light performance of the Ideal round brilliant cut and the two examples of poor diamond cutting, the fish-eye and nail head.

It will surprise many to learn that the ray trace diagrams in Figure 3, which explain some aspects of light performance in gemstones with refractive indexes much lower than diamond, are inadequate, and fail to explain the light performance in all three of these diamond cut examples. Shown in the work that follows is a unique way to use 3-dimensional ray tracing to test these conventional explanations.

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ACA Gemological Laboratory

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