Jewel palette
Umber Plaza
Five stops tuned to sit together without fighting — #004761 ink anchors the set, #71b7d8 opens it up, and #087196, #338cb2, #549abb cross the middle in a tetradic arrangement. Umber Plaza suits book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
cyanjewelfive-stophigh-contrast
#004761
#087196
#338cb2
#549abb
#71b7d8
The generator opens with #004761 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.