So you're setting the prices on gems to a specific number of bitcoins? That's pretty cool, assuming they're not overpriced. In theory, if every bitcoin merchant were to do that, it effectively keeps the value of bitcoins from going below a certain level. (Of course, if the gems and other goods are overpriced, it creates a ceiling for the price instead, devaluing bitcoins somewhat. So please don't do that.)
Anyway, I don't know a lot about gems, but this is at least interesting, if it's legitimate. I don't suppose you're planning to go into precious metals as well? Or just gems? Either way, kind of a neat service.