APPARATUS AND METHOD FOR ASSESSING OPTICAL QUALITY OF GEMSTONES

摘要

Provided herein is an apparatus for assessing a color characteristic of a gemstone. The apparatus comprises an optically opaque platform for supporting a sample gemstone to be assessed, a daylight-approximating light source to provide uniform illumination to the gemstone, an image capturing component, and a telecentric lens positioned to provide an image of the illuminated gemstone to the image capturing component. Also provided are methods of color analysis based on images collected using such an apparatus.

主权项

1. An apparatus for assessing a color characteristic of a gemstone, comprising:
an optically opaque platform, wherein the platform has a surface configured for supporting a gemstone to be assessed; a daylight-approximating light source shaped to at least partially enclose the platform, wherein the light source is designed to provide uniform diffused illumination to the gemstone on the platform; an image capturing component, wherein the image capturing component is positioned at a predetermined angle relative to the platform surface that supports the gemstone, and wherein the image capturing component and platform are configured to rotate relative to each other; and a telecentric lens positioned to provide an image of the illuminated gemstone to the image capturing component.