Patent ID: 9222893
Filing Date: 2015-12-29
Classification: G01J,G01N,G06K

Abstract:
1. An apparatus for assessment, evaluation and grading of gemstones, comprising a stage upon which a gemstone may be supported, the stage being enclosed in a housing that is impervious to light, at least one light source located in the housing and adapted to project incident light onto the gemstone, means for rotating and tilting the stage so as to vary the orientation of the gemstone to the incident light, a digital camera located in the housing adjacent the or each light source and adapted to take images of the gemstone based on reflection and/or refraction of the incident light, and information processing means for calibrating and analyzing the images, wherein the information processing means is programmed with instruction sets for assessing one or more of colour, cut, clarity, scintillation, brilliance, lustre, dispersion and sheen, and wherein the gemstone is supported upon the stage by securing means engaging the gemstone at its bottom surface, and wherein colour assessment of the gemstone is with an instruction set for colour calibrating the images and then analysing the colour calibrated images by segmentation and histogram measurement.