depends on the genetics
basic is this
agouti = rings, that's the main hallmark
self = no rings, same color all along the hair shaft with a lighter undercoat
but then you work your way past A_ B_ in to C
the color gene, where you have C-colored ,chl - chin light, chd - chin dark, and some say chh - Himalayan, and then you get the interplay of whats on the other side of the incomplete dominate, is it COLOR, c- no color ( red eyed white ), or another chin gene?
Then you work into D, dilute, makes black into blue, Chocolate into Lilac (shiny light gray with pinkish eyes)
then you work into extension, which will partially or completely remove the rings, or in the case of ej (harlequin) turn them sideways
and lastly you have wideband that extends the middle band up and down the hair shaft.
so you see, it gets really interesting, and you can actually make some colors a number of different ways, weird eh
I've had rabbits that didn't get decent color till after their first shed, others that looked great with their baby coats, and lost it as an adult.