Search International and National Patent Collections

1. (WO2017015912) METHOD OF TESTING THE COLOR QUALITY OF A COLORED GEMSTONE

Pub. No.:    WO/2017/015912    International Application No.:    PCT/CN2015/085476
Publication Date: Fri Feb 03 00:59:59 CET 2017 International Filing Date: Thu Jul 30 01:59:59 CEST 2015
IPC: G01N 21/87
Applicants: DENG, Wenshuai
Inventors: DENG, Wenshuai
Title: METHOD OF TESTING THE COLOR QUALITY OF A COLORED GEMSTONE
Abstract:
A method of testing the color quality of a colored gemstone is disclosed, taking the gem color as an entirety visually composed of different color components, whose total amount of color components is constant, so as to calculate hue-purity, color-strength and relative chromaticity of the gem color to test the color quality. The method comprises the following steps: (1) determining blackness, chromaticness and hue of the gem color; (2) calculating the hue-purity, color-strength and relative chromaticity in accordance with the blackness, chromaticness and hue; (3) finding a matching color in a pre-established standard color library for this specific gemstone according to the hue-purity, color-strength and relative chromaticity calculated in step (2), and use the name of the matching color to indicate the gem color and color quality.