About 10 years ago I had a matte finish gun-metal gray nail polish which I used until it was no more. Generally, I'll wear red, or sometimes something electric and not-found-in-nature colours, but lately I've been trying to find a proper gray. My favourite reds will be used up entirely, but most of my polish dies a lonely death at the back of the bathroom cabinet, gloppy, gooey and unsung. Sally Hanson had a pearly bluish colour called "gun metal" which Breda and I both wore on the same day almost exactly a year ago-- good taste, that gal. [I'm still squeeing from Tam's comment that we were covered in awesome sauce.]
Anyway, I have found a new polish to excel them all. One to rule and to bind them. er, sorry.
I went to Sally Beauty Supply last night, and even though I'd looked for a proper shark-gray colour recently there, I sighed, thought "what the hey" and looked again. I walked away from the nail polish display disappointed but unsurprised. I picked up a small item and went to the counter anyway and lo and behold, awaiting me at the register was a special display with three matte metallic colours, including this splendid Iron Butterfly by Orly. (better closeups of the product can be seen here at someone's nail polish blog)
Anyhoo, I think it's a seasonal offering and not part of their permanent collection so get it while you can. I may pick up a spare bottle. I'm squeeing.