This is the something else I layered over "Emerald Sparkle", I chose one of the best in my stash: Elytra n. 528!
Please note that my camera isn't the best, plus glitters are painful to photograph, especially these Elytra, later I'll explain why :>
Unfortunately, it looks like glitters are too spare on the nails, but you see that because pictures show you just the sparkling ones; to the naked eye, you can see the glitters of "Emerald Sparkle" under the ones of n. 528 melted together, like this:
(blurred photo, but shows well deepness of colours!)
Too many pictures, I know, but I hope they helped you noticing the awesomeness of n. 528 when layered, and you don't have to apply it necessarily over a black base :>
These are two coats of n. 528 over three coats of "Emerald Sparkle".
Have a nice day/night/whatever and thanks for your attention ;¬)