Want to showcase your rock in the best possible way? Then an au courant manicure is a must. Sparkle and metallics are top of mind right now and will continue to be popular throughout the blustery winter. Chic dark hues and jewel tones will also be go-tos as the weather cools down. From rainbow glitter and icy silvers to updated blacks and sapphire blues, these 21 new holiday collection polishes are sure to draw attention to your digits.