Evaluation of brilliance, fire, and scintillation in round brilliant gemstones

Jose Sasian, Jason Quick, Jacob Sheffield, James Caudill, Peter Yantzer

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


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.

Original languageEnglish (US)
Article number093604
JournalOptical Engineering
Issue number9
StatePublished - 2007


  • Diamond cuts
  • Diamonds
  • Gemstone brilliance
  • Gemstone cuts
  • Gemstone evaluation
  • Gemstone fire
  • Gemstone grading
  • Gemstone scintillation
  • Gemstones
  • Round brilliant

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)


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