I actually (sob) did not bring them with me this time as it's been so wet and slippy -- I took my black/velvet grey leather (which is lighter than the suede) JP Arizona instead as I had thick vibram soles put on them -- so I can't share with you. Sorry.
They are a truly neutral dark grey. Works with warm colours, cool colours, and, obviously, all the standard neutrals*. They go with absolutely everything! I know a lot of people think that only black will do in Birks but, as I'm pale, black can be a bit harsh in the thicker strap models.
Whereas this grey (and it does look grey, not a faded black, but it's still dark enough to have an air of class and not show any dirt) is softer against my skin and looks a little more understated and elegant, imo. It's seriously a colour that I would love to have in a purse, a leather jacket, boots, etc. I am in love!
*I bought a light cashmere poncho in a similar colour that can be used as a scarf as well to tie it all together in case I'm dressed all black or whatnot.