Eos makes a pretty nice machine for doing that. It costs about $1,000,000 USD (not including the atomized silver) and gets great detail, suitable for jewelry. I'm sure they'd sell you one in the US, but you might have to check with the local authorities about installing it in your residence.

US-based 3DSystems has their ProX line of 2-laser metal printers (used to be Phenix) which you can get for as little as $700k.

If you want to make metal objects with a 3D printer and don't have a spare million or so lying around, the more economical route is to print them in a material that burns out cleanly, and use the lost-wax method to transform the patterns into metal parts. Machines that can produce the patterns with jewelry-level detail include the Solidscape machines, which print in actual wax, and the B9 Creator, which uses a photo-catalyzed resin.

Andrew Werby
www.computersculpture.com