This is Essie's Set in Stones from the 2011 Luxeffects collection over China Glaze Secret Peri-wink-le. Set in Stones is a clear based polish densely packed with large and small hexagonal silver glitters along with some smaller circular glitter particles. It only took one coat to get the look shown below.
I am so happy I picked this polish up it's one of my favorite glitter top coats by far. The Luxeffects collection has some serious winners in it.