This is Iridescent Navy from Forever 21’s polish line, love & beauty. Well, the F21 site calls it Iridescent Navy… the bottle simply says Navy. This is the same as L.A. Girl Color Addict Idol (literally the same polish, just re-branded for F21).
This polish was opaque in two coats and applied smoothly. My only complaint is that the gold shimmer, which is easy to see in the bottle, doesn’t show as well once it’s on the nail.