This is 'Coat couture' by Essie which is from their cashmere matte range. I was lucky enough to get a set of three of them in TK Maxx! I can't remember how much they were but somewhere between £9.99 and £12.99 I think.
This polish is so pretty, it colour shifts in the light, it's opaque in two coats, it dries in about three minutes and it's matte so you don't need top coat. Quickest, prettiest mani ever!