The Gear Ring from Kinekt has functional gears in the middle that allow the bezel to rotate. And that's pretty much it. No lasers or anything. They're available in US sizes 9-12 for $165, and may need to be oiled from time to time. Not unlike the Tin Man! Who, fun fact: is not a robot. Don't get me wrong, I'd still crush his ass on my face like an empty beer can, he just isn't a robot. No laughing, Lion, you're next.
Kinekt Design's Gear Ring is made from high quality matte stainless steel. It features six micro-precision gears that turn in unison when the outer rims are spun (as can be seen in the video). You may purchase the ring here: kinektdesign.com