Eddie Borgo's woman's FW'12 Fashion Hinged Ratchet Ring has been my all time favorite statement jewelry piece I have yet to put my hands on. This emulates a mechanical knee brace for the finger, don't you think?
"Hinged Ratchet Ring"
Woman's Core SS'13 Fashion "Hinged Plate Ring"
Woman's Holiday '12 "Pave Hinged Plate Ring"
Check out why I am so obsessed with his jewelry designs here.