System And Method For Grading Clarity Of Gemstones

Abstract: Systems and methods for grading a gemstone including its clarity are presented. An image capturing device disposed to capture images along a line of sight; a holder to support the gemstone thereon; a manipulator arm, carrying the holder, configured to rotate along a roll axis, and allow for rotation of the holder along a pitch axis; an illumination sub-system comprising a direct illumination arrangement, a dark-field illumination arrangement, and a facet illumination arrangement; and a controller arrangement configured to control the illumination arrangements to generate a plurality of illumination patterns for the gemstone, control the manipulator arm to position the holder for a plurality of orientations of the gemstone, control the image capturing device to capture an image of each of the generated illumination patterns, each of the orientations and each of one or more depths of focus, and process the captured images to grade the gemstone.

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents