We really like these man-rings from Brian Bergeron Design. If you have a need for chunky, metrosexual jewelry you can choose between car, motorcycle or mountain bike tyre styles. They start at around $100 for the silver versions, but there is also a range of gold types, palladium and platinum, with prices topping out at around $3700.
Now, pop some LEDs in there and I might just have to find an excuse to get married.
Product page [Brian Bergeron via Coolest Gadgets]
