SomeMagic has made a pretty nifty little ring here. Hailing from..."Europe," they've gotten some pretty good Etsy reviews and their prices are low. The ring at right costs only $10.85. The ring is adjustable and the band comes in two styles which I like. They are not, however, waterproof. If looking at this ring or the countless others in their shop, I would bear in mind the quality could be a little low, but the look of it is awesome. So, as long as you don't get too attached to it you should be fine. At the price they're practically disposable. I say go for it.
Be sure to check out their Etsy, Twitter, and Facebook. (Note: after a little digging, they are out of Lithuania).
Trevor's Rating of the Astronomical Steampunk Ring: 80% (For a visually interesting ring that is not waterproof and may not be the best quality, but is still worth a look for the wearer who isn't concerned about such things).