Do some Google searches for "light tent".
They are pretty cheap, and also easy to make one yourself once you get the general idea. Get at least 3 or 4 lights that you can position around the tent. Don't use flash, as you will likely get a lot of reflections that will be hard to control, shoot available light from a tripod. Shadows are easy to eliminate by moving your lights around and just checking visually.
Not jewelry, but you get the idea. The background was a simple piece of poster paper curved in the tent.
Here are two really crappy pictures of my setup, to give you an idea.
I've since got a commercial tent, which is a bit nicer, and changed all the lights out to Home Depot halogens. You can get them with stands, I just used parts of my PA system to rig the lights up.
It's a bit of trouble to set up, but once you get it right, rotating your subjects thru should go pretty quickly. You can do this with your Rebel pretty easily.