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Chroma value is changing with lighting conditions and can not be easily transformed into a certain color grade.
Color grade borderlines are also changed with hue.
C – Chroma, RC – relative contrast
4,02 ct Cr = 36° P = 43°
Office light: C = 20.24, RC = 0.64 Dialite light: C = 32.51, RC = 0.21
5,21 ct C = 48° P = 47.5°
Office light: C = 28.90, RC = 0.54 Dialite light: C = 31.94, RC = 0.18
Then an expert works with optimization results for each shape. It different lighting conditions one can compare stones before and after optimization: