Patent ID: RE44963

Claim:
A method for grading the cut of a gemstone, comprising the steps of: illuminating a computerized gemstone model using an a computerized illumination model, wherein said gemstone model is a full three-dimensional (3D) representation of said gemstone that defines the geometry and position of all of the gemstone facets, and wherein said illumination model produces a light beam; refracting said light beam into said gemstone model through a first facet of said gemstone model to produce a refracted light beam , said refracted light beam via said first facet of said gemstone model is modeled with a three-dimensional shape and the three-dimensional shape of the refracted light beam is defined by an area of said first facet ; reflecting said refracted light beam within said gemstone model from a second facet of said gemstone model to produce a reflected light beam; refracting said refracted light beam out of said gemstone model through said second facet of said gemstone model; refracting said refracted and reflected light beams beam out of said gemstone model through a third facet of said gemstone model to produce an exiting light beam; and measuring said exiting light beam.