Patent ID: 8498847
Filing Date: 2013-07-30
Classification: G01N,G06T

Abstract:
1. A computer-implemented method for grading symmetry or proportion of a multifaceted gemstone using a mathematical model of the gemstone stored in a computer-readable memory, said method comprising: determining groups of facets of said gemstone wherein each group of facets contains a respective subset of facets that are related to each other according to a predetermined axis of symmetry; simulating transmission of a plurality of simulated electromagnetic waves through the gemstone so as to propagate via successive facets according to their related geometry and optical characteristics; associating the simulated electromagnetic waves with a respective trajectory group such that all of the simulated electromagnetic waves in each trajectory group strike facets in identical groups of facets and in an identical sequence; for each trajectory group, determining a respective dataset representative of the energy collected on a predetermined surface or a function thereof; and using said datasets to determine a measure of symmetry or proportion of the gemstone along said axis.