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Optical Engineering

Evaluation of brilliance, fire, and scintillation in round brilliant gemstones
Author(s): José M. Sasian; Jason Quick; Jacob Sheffield; James Caudill; Peter Yantzer
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Paper Abstract

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.

Paper Details

Date Published: 1 September 2007
PDF: 25 pages
Opt. Eng. 46(9) 093604 doi: 10.1117/1.2769018
Published in: Optical Engineering Volume 46, Issue 9
Show Author Affiliations
José M. Sasian, College of Optical Sciences/The Univ. of Arizona (United States)
Jason Quick
Jacob Sheffield
James Caudill, American Gem Society (United States)
Peter Yantzer


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