This a long-discontinued polish, now - Sephora by OPI Sugar Plum Fairies Gone Wild:
(You don't hear about Girls Gone Wild much any more, so I imagine there are a lot of people who wouldn't even get this joke.) I would call this an orchid glitter in a clear base. It looks here like it may have some holo glitter in it as well. It's from a line called "Jewelry Top Coats" so obviously it's not meant to be worn on its own.
I don't wear this much but I can't see getting rid of it. It's pretty, and for whatever reason I'm kind of sentimental about the S-OPI line, as well.