For this I used three polishes, Coalest Day of the year and Night Moves Both from Barielle Shades and Black on Black from sinfulcolors (I really need to get another bottle soon)
I started with two coats of Night Moves which is a lovely bright silver foil. after waiting for it to dry, I used my trusty Ring binder hole reinforcements to create the half moon shape.
Then using Black on Black, Coalist Day and a bit more of the night moves I sponged on the gradient. this took three thin coats. while the polish was still wet I carefully removed the hole reinforcements with tweezers, then applied a coat of Seche Vite!