Now, before you move on to the pictures I want to say that this wasn't nearly as spectacular as it looks here. The first three pictures are taken underwater, and the rainbow is much more prominent than it is in person.
This is Finger Paints It's an Original (shown alone here) with Ozotic Elytra 528 on the tips (about three coats starting father down the nail each time).
The following two pictures are not taken underwater, but are in very indirect, dim light, which is the only other time I could see the rainbow at all (besides in the water).
Unfortunately, this was so disappointing that I ended up taking it off pretty quickly. Mostly, it looked like simply teal glitter on the tips of the purple, and it just didn't "pop" like I wanted it to. Oh well, at least the pictures look pretty.