|Chroma value C combines Brightness and Saturation.
Fancy-color grades depend on the path length of light through
the cut stone.
Here one can see a potential for different spectra to achieve a particular grade, for example Fancy Vivid or Fancy Intense. Chroma on this diagram is a combination of brightness and saturation. The potential means that if a cutter can cut a diamond with a light path between maximum and minimum plate thickness the diamond will be graded accordingly.