Vibrant cobalt blue nail polish. *For a limited time only, receive a FREE 4 mini collection when purchasing 1 selected Nails Inc polishes. Simply add 6DJQ4 to your basket, price will be deducted at checkout. Bright colours are this season's hottest trend so treat yourself to our brand new Baker Street polish is the glossiest, most striking shade of the year! When Beyonce first ventured out after the birth of Blue Ivy she wore this vibrant shade in tribute.