Office Hours - Color Difference Equations

[@joshh2317]

Does this lesson apply to gemstones too? I’m in school for gemology and we’re talking about different color scales for grading and appraisal of gems. And I have never learned about this before so I’m a total new student to these color equations and I’m genuinely curious if this also applies to that? Thank you for any help at all!!!

[@BYKGardnerUSA]

Hi Josh, from what I could find about Gemstone color grading, a visual analysis is performed based on hue, tone, and saturation. Typically, gemstones are not measured using spectrophotometers but as actually visually compared to charts of known colors references specifically made for gemstones. The scale and equation system mentioned in this presentation is very different than the traditional gemstone color grading, but you could theoretically apply CIE color space to gemstones and measure them with spectrophotometers.

[@dhruvshah2511]

Very nice video. Can you upload a video in which you show calculation of DE CMC in excel. As it is very complicated to understand here. Also can you please throw some light on Adjusted Values? Xrite has adjusted values for all things. 3NH doesnot have adjusted values for any. Can you teach us how to calculate adjusted values mainly for L A B and DECMC?

[@BYKGardnerUSA]

Thank you for your comment! For a discussion to have your specific questions answered, please contact Noah, our Applications Specialist, at [e-mail].