I have a couple grays to post for you today.
Tailored Creme by Sally Hansen
(3 coats)
I don't think I can jump on the old school nail polish bandwagon. This is my only exposure so I'm being unfair but stilllllll. Yes, the color ROX but that's 3 coats and there are bald spots everywhere, it's not B3F and, most egregiously, it doesn't fit in my helmer!
Studded by MAC
(3 coats)
I was attracted to this one because it was a lighter gray than the mattes I had. I should do a comparison post. It was surprisingly sheer, needing 3 coats. It was much more like a Zoya matte than an OPI matte in terms of application control (more) and dry time (more).