This is Esmaltes da Kelly City of Ashes and Zoya Luna:
here's The Swatchaholic, looks like you can see the gray there, a bit better. This was from the utterly insane UltraGlitter collection, way back in 2009 - that was before I discovered Zoya, myself. But you could still get these a couple of years later when I finally did, and I wish I'd gotten at least one more of them, really. Luna is really awesome jelly sandwich material, that's my favorite thing to do with it.
Esmaltes da Kelly is a Brazilian indie, I believe - you can get some of her polishes on Color4Nails, but not this one. At the time I bought it I didn't even really know what the hell it was, but Llarowe was having a sale and I was like, oh, what the heck. It doesn't even say the brand name on it, and I wasn't paying that much attention when I threw it in my cart, so I had to puzzle that part out later on. Since everything about it is in (what I assume is) Portuguese, I'm not 100% sure what the name refers to, either, and Google Translate is not much help. But the only City of Ashes I know of is the Cassie Clare book, so that's what it's named after in my head, anyway.
Added: I went on at some length about COA being a "mystery" in this post back when I first got it.