Sinful Colors - Black on Black, then added a coat of Indy's Indies - Baubles, and fished for a few extra glitters to get a pretty dense coverage. (By the way, Indy's Indies is shutting down for a while by the end of the month, so if there's anything you want, you may want to grab it soon!) Then I added a few coats of Gelous, some Seche Vite, and let it dry completely. Once it was dry, I taped off opposite corners of each nail, and filled the rest in with black before peeling the tape up. Another top coat, and some more drying time, and then I added some striping tape down the divide.
Don't forget to check out the other Round & Square mani's in the thumbnails below!