Updated October 2015:
If you would like an alternative to Mentality Gala, Model's Own Indian Ocean works perfectly! Just layer two coats over a turquoise base (I used Zoya Rocky below), and top with a matte topcoat.
Gala: is a blue matte jelly chrome with glass flecks that shifts red, orange, yellow, to green. Two coats, no topcoat. This color reminds me of sea glass, it's super pretty. (Just a note though, make sure to wear a base coat with this, I got some light staining when I wore it.)