Pumice polishers are generally safe to use next to most precious and synthetic stones. Great for polishing bezels and prongs that are already set.
The fine abrasive adds that final shine to metal surfaces. For best results, run the polishers at 7,000–10,000rpm with very light pressure.
Knife edge wheel measures 7/8" x 1/8" (22.2x3.2mm)
Use a 3/32" screw top mandrel (#43.128)
These are the fine grit pumice wheels, made by Eve of Germany.