According to various embodiments, a chromaticity diagram device (100, 300, 500) may have the following: a chromaticity diagram (102) which has a plurality of mutually different reference colors (102a, 102b, 102c), wherein the chromaticity diagram (102) has a transparent or translucent recognition region, by means of which a color of a hair tuft can be captured; and a hair clip device (106) attached to the chromaticity diagram (102) or integrally formed on the chromaticity diagram (102), which hair clip device is arranged to clamp a hair tuft to be captured in its hair color to the recognition region.