BERGEON 6807 Fine - Coarse Diamantine Powder 15g OR 100g for Watch Jewels. Diamond powder, best used for polishing and widening watch jewel parts. New and unused, extra polishing tools and watch parts not included. Comes in either Fine or Coarse grain with either 15 grams or 100 grams amounts of each available (see variations for quantities of each grain and container size).