Burberry black brass bangle with raised spikes at Gilt.com.
I was going to buy this for Emily, but then it sold out. Need. Want.

[If you're not a member of Gilt yet, click here to join...loads of good deals to be found for men and women, whatever your flavor.]Looking sharp. Photograph from V55 by Richard Burbridge, with styling by our lil' buddy Brian Molloy.