hyacinthine

Of the colour of a hyacinth (either the gem or the flower); reddish-gold (chiefly with reference to hair).

His fair large front and eye sublime declared / Absolute rule; and hyacinthine locks / Round from his parted forelock manly hung / Clustering, but not beneath his shoulders broad:

[…] the nicest young man that ever was, — daintily gloved, patently booted, oilily curled, snowily wristbanded, with a lovely cambric (prima facie) handkerchief bound about his hyacinthine locks and polished hat.

Curling like the petals of the hyacinth.

Beautiful, like the mythological Hyacinthus.