You will need a progression of diamond laps, typically starting with a coarse 260 or 600 grit for rough shaping, a 1200 or 3000 grit for pre-polishing, and a specialized polishing lap (like a tin alloy or Ceramic lap with diamond powder).
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"introduction to meetpoint faceting" filetype:pdf "meet point faceting" beginner guide pdf "faceting meets" free pdf lapidary You will need a progression of diamond laps,