Attached Link: http://www.artcam.com

Depending on what material you want to work in will dictate what system you use. I do jewelry work also(too many hobbies!) and the systems that carve wax for the trade do so at 1/1000 of an inch of accuracy. These can be lost wax cast and then used to create a master with a vulcanizing rubber setup to make more wax molds for multiple castings of an item. Try this link to see the software used they can put in touch with someone that can do it for you.