The Gear Ring by Kinekt Design features 6 micro-precision gears that turn when the outer layer is spun. As clearly seen in the video above. The ring is made of matte stainless steel and available right now for $165.
I wish it weren’t so bulky because this really would make for a playful wedding ring. Not that I’m a gearhead of anything, I just like the idea of having a ring that looks like something Spacely Sprockets created. [via]