Originally Posted by GB
I am curious about this as well. My guess is that the diamond stones take off more metal than the whetstones. I would think it would take less passes over the diamond stone to achieve the desired result, but you would also need to be more careful because you could screw up easier if you didn't do it right. This is just a guess. someone who know please chime in :)
I have used a Diamond hone at a local hardware store they have out for their customers.
You are right they do take the metal off. But, the resuilts are a very sharp blade with a minimun of strokes.