1 September 2007 Evaluation of brilliance, fire, and scintillation in round brilliant gemstones
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We discuss several illumination effects in gemstones and present maps to evaluate them. The matrices and tilt views of these maps permit one to find the stones that perform best in terms of illumination properties. By using the concepts of the main cutter's line, and the anti-cutter's line, the problem of finding the best stones is reduced by one dimension in the cutter's space. For the first time it is clearly shown why the Tolkowsky cut, and other cuts adjacent to it along the main cutter's line, is one of the best round brilliant cuts. The maps we introduce are a valuable educational tool, provide a basis for gemstone grading, and are useful in the jewelry industry to assess gemstone performance.
© (2007) Society of Photo-Optical Instrumentation Engineers (SPIE)
José M. Sasian, José M. Sasian, Jason Quick, Jason Quick, Jacob Sheffield, Jacob Sheffield, James Caudill, James Caudill, Peter Yantzer, Peter Yantzer, } "Evaluation of brilliance, fire, and scintillation in round brilliant gemstones," Optical Engineering 46(9), 093604 (1 September 2007). https://doi.org/10.1117/1.2769018 . Submission:


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