It's definitely a small. And the grey has more beige of a color mixed in.
I think it's very similar to Palladium and has the same white thread before the chain. But Palladium might be a bit shinier w/ a touch of blue. http://cdn.yoox.biz/45/45257933dp_11_f.jpg
Ruthenium is much darker and has a darker thread before the chain, and it's has a metallic mix to it: http://www.fashionphile.com/stella-mccartney-faux-leather-falabella-chamois-tote-ruthenium-39309
It's kind of like my SAND, my sand looked just like Powder, but Powder had a touch of pink to the ivory/beige color where as sand was a shimmery ivory beige.
Of the 3... I definitely like the Palladium the best. It's a nice crisp grey. HTH![]()
Oooooo look at this, on Stella's page she has the grey and palladium side by side with each other, scroll down towards the bottom: http://www.stellamccartney.com/us/online/stella-mccartney/women/bags/