I'm really surprised I hadn't swatched this until now. I've had it for ages.
KBShimmer's Showgirl is a black jelly with pink-magenta and black hex glitter, a scattering of holo micro bar and hex glitter, and holo square glitter. The glitter look kind of purple here under the strange light, but it's definitely more pink-magenta. I used a black polish underneath for a base because the black jelly would have needed four coats to cover the nail line.
The glitter was dense enough that two coats gave a lovely amount of coverage. I don't know why but this makes me feel like I'm looking at outer space, which I rather like.