Polishing is a technique doing surface treatment to semi-finished products. Experienced workers choose suitable tools according to materials and surface effects and make careful and repeated polishing to the surface. It removes the dirt on the surface, eliminates the defects of the surface and makes trimming to the blanks to make the surface of blanks smooth. The procedures are: polishing, brightening, and adjusting pins, shapes or tongue pieces. After this process, these semi-finished products will be sent to welding, gemstone setting or polishing according to their designs.