Wow, what an interesting nail polish. This is a dark grey with silvery microglitter, and it dries to a matte finish. I've never seen anything quite like it, though I've seen plenty of metallic greys and mattes. It really does look for all the world like graphite, although it might also be described as gunmetal grey.
I found the application to be very good, quite smooth, and I found I could get full opacity and coverage in just one coat (though I did two, because I think the manicure lasts longer that way).
You can finish this with a shiny top coat if you like, or use a matte top coat for extra protection. It looks good shiny; the glossy top coat brings out the silvery glitter. It also looks beautiful matte (which is how I prefer it).
After reading all the reviews on here that say it chips super easily, I tried an experiment. I used a basic, clear base coat (Poshe Quick Drying Base Coat), let that dry completely, then put on two coats of Stone Cold, and no top coat at all. I kept the polish on for four days, and in that time there was normal tip wear (the tips wore to an interesting silvery colour, actually, very pretty) and one nail had a surface scratch that could only be seen in certain light and if you were really looking, but there was no significant or even especially noticeable chipping. I do not baby my hands (I type constantly, do dishes, drive, cook, etc. etc.). Admittedly, I wasn't making pottery or digging bare-handed in the garden or using my nails to scratch wallpaper off or pry things open, etc., but I certainly was leading my normal life as a student and mum (i.e., medic, chauffeur, chef, laundress, tutor, seamstress, dispute arbitrator, typist, etc.), and not worrying about my nail polish. In fact, I was kind of hoping it would chip or something, just for interest's sake, but it didn't. I'll try it again some time and see if that was just a fluke, and if so, I'll amend this review, but I truly didn't have any chipping issues with this polish, even without any top coat.
Another thing I've noticed about this polish is that as you wear it longer, it becomes slightly less matte and more satiny, or perhaps it's just that the dark grey pigment slowly erodes leaving more of the silver microglitter visible. It's interesting to watch it evolve, I think.
Really novel polish, definitely in the "well, that's different" category. Love it enough that I bought a backup bottle.
UPDATE: I repeated the experiment with chipping, and, again, no top coat, four days, no chipping. I did get tip wear, and by the end of the fourth day the polish was starting to become somewhat satiny as opposed to matte, but still no chipping. I DO experience chipping with many polishes (sometimes more or less, depending on which base coat I use), but this polish seems pretty solid to me. I like it enough that I bought a backup bottle.