The agouti group of colours carries the original (wild) colour pattern, where the body colour comes from hairs that are banded. The tip colour is determined by the B and D genes and is black in castors, chocolate in ambers, blue in opals, and lilac in lynxs. Next to it along the same hair shaft should be a red or orange colour in the castors and ambers (the redder the better), and a lighter fawn colour in the opals and lynxes, all allowing for a bluer hue in the blacks and a browner hue in the chocolates. Farther down the hair shaft is a blue colour which should be slate in the castors and opals and much lighter in ambers and lynx. The base is a light dove grey or white. The guard hairs are typically the ones that are tipped. The surface belly colour is tan, off-white, or white again, with the dilutes having the lighter colours. The undercolour should be the same as the undercolour of the body.

The second Shading Gene can be c^chd, c^chl, c^h, or c, but not C

The chinchilla gene prevents some of the yellow pigment from forming, leaving the animal looking much like a 'black & white' version of the full colour. Since some yellow remains, the midband (and any other parts that would normally be red/yellow) will have a pearl colour rather than being white.

In Rex, only the black version of Chinchilla is recognized.

(Black) Chinchilla
Chocolate Chinchilla (Red Squirrel)
Squirrel (Blue Chinchilla)