Once again, greens are the dominant color of the season. They've been reinterpreted for winter in richer, jewel-toned shades like emerald and hunter green.

Zoya Holly Nail Polish, $8, available at Zoya.

Topshop Fallen Leaf Nail Polish, $12; to order, call 212-966-9455.

Illamasqua Kink Nail Varnish, $14, available at Sephora.