This is BYS Magenta (one of the color changing series), topped with Essie As Gold As It Gets (which is sadly not apparent here), stamped with Sally Hansen Pink Satin + BM206 and China Glaze Passion + BM313 and mattified with Rimmel.
I tried this polish out as I figured my nails were long enough to possibly see some gradient as the tips would be cooler in temperature. Please click read more if you want to see more pics of Magenta and my review.