You need a couple more weeks (at least) for them to be sexually mature. That coloring cannot be sexed by the color of their plumage. You'll need to vent sex them (once sexually mature) or wait for either crowing or eggs.
@DK newbie could you please post a picture of the head turned to the side (not fronting). Also, if you are keen on taking a picture of the vent as well. This quail does NOT have spots, so if only looking by the spots it is a male. That's why another picture of the head would be helpful.