Tiffany Frank Gehry Torque ring in 18k white gold, $650.
UPDATE: This ring is soooo not right. It was all square and mannish looking on my finger. Didn't fit with my engagement ring at all. The lady straight up told me not to do it, and that I should get a "classic" platinum ring and "leave the funky" for other areas of my wardrobe. However, none of the other Tiffany rings spoke to me. Le sigh.