Abstract: A polishing device is described particularly useful for polishing table facets of gems, the device comprising a rotary polishing disc and a plurality of spring fingers mounted in cantilever fashion to overlie the polishing disc, with each spring finger including a pad formed with a socket adapted to receive a gem to be polished by the disc. A pressure bar urged by an electromagnet overlies the upper faces of all the spring fingers to apply a preselected, substantially uniform pressure to them during the polishing operation.

Abstract: A device for holding precious stones during cutting and polishing the facets thereof comprises a rod having a mounting tip at one end for mounting the stone, a positioning collar loosely received on the rod so as to be movable both axially and rotatably thereon and including a plurality of flat faces on its outer surface each adapted to be pressed against a locating surface of an aligning fixture for positioning the stone with respect to a cutting or polishing disc, an indexing collar having a plurality of indexing positions, and spring means for fixing the positioning collar to the indexing collar and the latter collar to the rod at desired preselected positions.