Thomas thanks for your interesting pictures. It is a good food for thought. 
Sometimes ago I was asked to make a ritual knife with a stone handle. It was necessary to drill a 1/3" hole into the stone handle. I used the wet grinding grit worn from a Tormek grindstone as a cutting fluid and it worked fine. The knife is not finished yet but the handle is more or less done.
The grinding grit residuum cannot be put down to the sink because it would cause plumbing problems.
Jan
Sometimes ago I was asked to make a ritual knife with a stone handle. It was necessary to drill a 1/3" hole into the stone handle. I used the wet grinding grit worn from a Tormek grindstone as a cutting fluid and it worked fine. The knife is not finished yet but the handle is more or less done.
The grinding grit residuum cannot be put down to the sink because it would cause plumbing problems.
Jan