It's Midnight Date, which has a nice sparkly dark blue nailpolish with tiny glitters, and a topcoat filled with green flakes and glitter. The topcoat is a clear lilac, but you don't really see that on top of the dark blue. It might change the polish you're wearing of you use it on top of a lighter colour though. Might be fun to try out sometimes.
Just Midnight Date:
Midnight Date with City that Never Sleeps on top:
I'm usually not a big fan of blue on my nails, don't know why, but I really like this one. :)