Jīd means neck, often suggesting an elegant neck in poetic diction. Muʿamm describes one whose paternal kin are honorable; mukhawwal describes honor through maternal kin.
These expressions evoke a costly ornament worn by a person of recognized family standing. The actual subject remains the herd; the necklace on an esteemed person’s neck is the vehicle of the simile.
The image thus unites color, arrangement, adornment, and social prestige in one compact scene.