APPARATUS FOR EXAMINATION, EVALUATION AND CLASSIFICATION OF PRECIOUS STONES Russian patent published in 2013 - IPC G01N21/87 

FIELD: physics.

SUBSTANCE: apparatus (10) for examination, evaluation and classification of precious stones has an object table (11) on which a precious stone can be placed. The object table is enclosed in a housing (15) which is impervious to light. At least one light source (14) placed in the housing is adapted to project incident light onto the precious stone. A device is provided for turning and tilting the object table so as to vary the orientation of the precious stone relative the incident light. A digital camera (16) is placed in the housing, neighbouring a certain or each light source and adapted to record images of the precious stone, provided by reflection and/or refraction of the incident light. There is also a means of processing information for calibrating and analysing images, said means being programmed by a set of commands for colour calibration of images and subsequent analysis of the colour-corrected images by segmentation and constructing histograms.

EFFECT: improved device.

6 cl, 15 dwg, 1 tbl