It's basically a glitter polish, but the glitter is really, really chunky.
It takes a bit of patience, but when you get enough coats on there, it's a really awesome look that will last for ages.
To make it look like it does below, you need to start with a base of colour. I used a blue from the OPI Texas collection. Then I did 4 coats of the 3D polish, then topcoat, waiting for each coat to dry before adding more.
It's the kind of nail stuff to do while you're watching a movie, or have a good half hour of quiet time.
I think you'll agree that the effect is well worth the extra time.