All that glitters
Use tent lighting for small,shiny objects,completely enclosing the obect in a diffused light chamber. You can construct such an environment from a simple matte acetate cylinder,though the opening at the top of the cylinder could cause dark reflections. you could also use a cone that would extend from the camera lens to the shooting table. For the setup to be light fast ,you'll have to take care in cutting the bottom of the cone so it sits flat on the table. For a cheap and easy option, cut out the bottom of a frosted plastic gallon water jug and placeit over the object on a light table or white surface. place a light outside the jug, and shoot through the mouth of the jug.
-Al Francekevitch,"Lighting Small,Shiny Objects." PP Archive