From Thinkgeek:

This clever ring is hand-cast in solid sterling silver and mimics the Stargate, with two separate, highly detailed components: an outer ring and an inner ring. The outer ring has a three-dimensional design that features the nine chevrons (visible from both sides) and architectural detailing along the top. The inner ring sports a screen-accurate recreation of the glyphs that orient the Stargate, also visible from either side. The best part? The two rings actually spin around each other! The only thing missing is the artificial wormhole, and really that’s probably for the best. We wouldn’t want anyone losing a finger in a mini Chappa’ai. Feel free to give this ring a spin and see if you get to work faster, though!

[Stargate Sterling Spinner Ring]