OPI's Baby it's Coal Outside from the 2008 Holiday in Toyland collection
It's a dark black polish with silver (and slightly greenish) glitters heavily loaded in the formula.
I have come to a conclusion that black polishes look so much better on short and wide nails rather than long, thin nails.
It applies quite nicely - it's not super thick but it's not thin either. There is no difference between two coats and three - it's pretty much the same so I think 2 layers is enough.