I'm really loving GOSH Rainbow! I may need an extra bottle. I've worn it over black and other dark colors but I wanted to see what it looked like over a white. I don't own a white but I do have Color Club Who Are You Wearing? which is a light grey almost white.
It looks like an opal. Really very pretty. It's subtle but not too subtle. You can still see the flash of colors really well. I cut my nails and it looks great on my nubs.