Goldway Technology Limited

Wing Yan Lee

Koon Chung Hui

Ka Wing Cheng

Wing Chi Tang

Juan Cheng

Chun Yan Dominique Lau

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 (); (ii) comparing the N3 and C-center content of the diamond with a previously acquired data set from a plurality of diamonds each having a colour grading previously assigned thereto, and (iii) assigning a colour grade to the diamond upon a correlation of the N3 and C-center content of said diamond with a grade of said previously acquired data set; wherein said previously acquired data set comprises a correlation between N3 and C center content and optical absorbance in the visible light spectrum for each diamond of said plurality of diamonds.

Growing community of inventors

Hong Kong, China

Wing Yan Lee