Here are a few pieced made while experimenting with piping silver clay. The pendant is formed around a large 12mm cubic zirconia stone, this was placed in the center of a ball of cork clay, left to harden. Then had the silver clay extruded from a syringe into the pattern on the surface. Once hardened this was torch fired and after 10 minutes or so the cork had all burnt away leaving the stone rattling around inside the silver cage.
Also a few rings made similarly by piping clay around a mandrel form.