Difference between Amethyst and Chromatic

Amethyst

Part of speech: adjective

Definition: Having a colour similar to that of the gemstone

Part of speech: noun

Definition: A transparent purple variety of quartz, used as a gemstone. A purple colour. The purple tincture when emblazoning the arms of the English nobility.

Chromatic

Part of speech: adjective

Definition: Relating to or characterised by hue.Having the capacity to separate spectral colours by refraction.Regarding all twelve traditional Western pitch classes, regardless of temperament or intonation; Regarding entire sets of alternative pitch class systems.