Mostly for fun, I put together an assembler or calculator of sorts, to show what finished jewelery of various types would look like. It's still in testing, but it seems to work so far. I've checked it most with Mozilla 2.0 and IE6, so I'm not sure if it works on other browsers.
Any feedback or bug reports would be appreciated. Once all the kinks are worked out, I hope to add it to the EQTC site.