ALEXANDRIA, Va., June 10 -- United States Patent no. 12,292,385, issued on May 6, was assigned to GOLDWAY TECHNOLOGY Ltd. (Hong Kong).
"Gemstone colour grading process and grading system" was invented by Wing Yan Lee (Hong Kong), Juan Cheng (Hong Kong), Chun Yan Dominique Lau (Hong Kong), Wing Chi Tang (Hong Kong), Ka Wing Cheng (Hong Kong), Ching Tom Kong (Hong Kong) and Koon Chung Hui (Hong Kong).
According to the abstract* released by the U.S. Patent & Trademark Office: "A process of assigning a colour grade to a diamond, including the steps of (i) determining the N3 and C-center content of a diamond (110); (ii) comparing the N3 and C-center content of the diamond with a previously acquired data set from a plurality of diamonds each ha...