I recently ordered some Diamond Cosmetics polishes for the first time ever!
This is two coats of Deep Blue Sea.
I'm really impressed! Great application, formula, and cheap, too!
This is a darker blue than my sunny pictures would lead you to believe. It's almost navy. And the lovely shimmer is turquoise blue.
It would seem that this is very close to Orly Royal Navy, which I am yet to try. The shimmer in Deep Blue Sea appears to be bigger and more prominent, as well as a different color (the shimmery in Royal Navy is greenish, if I'm not mistaken).