Colour grading process and system for diamonds
US10762666B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2018 |
| Grant date | Sep 1, 2020 |
| Priority date | — |
| Expiry date | Feb 15, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/87
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A computerized system for grading the colour of a diamond, wherein the colour of the diamond is graded based on a predetermined threshold of correlation of colour of a diamond with the colour of a diamond of a plurality of diamonds each having a colour grading assigned thereto, the computerized system including: an optical image acquisition device for acquiring at least a first optical image of a diamond, wherein the first optical image is acquired at a predetermined angle of inclination to the central axis extending normal to the table and through the apex of the pavilion of the diamond and in a direction of towards the table and wherein the first optical image is acquired in an environment having a predetermined constant light level; a processor module for comparing data derived from acquisition of the at least a first optical image with a plurality of data sets each of which corresponds to a diamond of a plurality of diamonds, wherein data sets are each derived from an optical image acquired by an optical image acquisition device in an environment having a predetermined constant light the same as that as (i) and each of the data sets is assigned a colour grading, and wherein sai…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.