Forever21's nail polish line, Love & Beauty. The tag in the bottle I got calls the shade "Midnight" but the website calls it "Pewter." I don't really care, I'd buy the shade either way.
The nail polish is not bad for less than $3. Multiple applications is needed until you reach your desired darkens and sparkliness balance - this might be because of the consistency of the nail polish. I have never really been a fan of black nail polish so this shade is perfect for me, it's dark but it has that sparkle factor.
No, I do not put nail polish on my fingernails because it makes my fingers feel dry.