Like an Opal. :)
I tried it over black, and also white. It's amazing to think this is the same polish. It can go from edgy and cool over black with the glitter showing up yellow green and blue, to girly pretty over white with the glitter showing up translucent pink, purple, and yellow! Lovely! The formula was a little thick but it's probably because it was totally packed with glitter! It helped make this a 1-coat polish. The dry time will have you out of the game for a while though so go potty before painting your nails!