Hi- thank you all for the responses!
Putting the ring in a sealing device wouldn't work; I would like to be able to wear it. I've tried painting it with black nail polish and with clear coat; they've both rubbed off pretty quickly. I did find a link detailing how the author used to cast things as a kid- I think I'm going to try that. (I can post the link allthough I'm not sure how to insert it.) I'm just not sure what the best metal to use would be. I don't really have the resources to make a crucible or anything; I've been offered the use of a beer brewing camp stove type thing by a relative, which seems promising, but I'm just concerned about melting the pan we use to melt the metal, so it can't be too hot. Gold would be nice and durable, but maybe a bit overkill for what originated as a crappy costume ring. Zinc is what the link suggested, so that might work, but I'm leaaaning towards sterling silver. Any tips for this are appreciated. I probably won't go casting house unless they can do it under 200 (doubtful) but I'm a little worried about this method.