This is a cool-toned charcoal gray microglitter with a generous dusting of scattered holographic (color-changing) microglitter. It definitely isn't a layering glitter - it's actually opaque in two coats! My only quibble is that I need two thick layers of topcoat to keep it from being snag-my-hair rough, but that's minor. I suspect this will go down in history as one of my favorite polishes. About US$2 @ Walmart.
This polish is from the Sally Hansen "Gem Crush" glitter line.
I'm a huge fan of glitter nail polish, and I expected to love this. Unfortunately, I don't. In the bottle, it looks like a sooty, dark-to-black glitter, but on my nails, it's a kind of bland charcoal-silverish with a definite but dark blue tone. The multi-colour holographic glitter bits are not anywhere near as interesting on the nails as they look in the bottle, unfortunately. This is not a layering polish (it is opaque in two coats), but in trying to use it so that it appealed to me, more, I tried it over black (or other dark colour) and also over navy blue, but the glitter polish just gives a weird, cloudy effect. No matter what, the colour just seems dull, and I don't mean "boring", I mean, not bright.
I've worn this a couple of times trying to see if it would grow on me, but I'm pretty... meh. And that's VERY strange for a glitter polish for me. As I said, I'm a huge fan of glittery nails, but this just leaves me cold, unfortunately.