Many of my naturals do not have a slurry stone and I do not wish to use a DMT for the scratches it leaves, neither did I wish to cut a piece off leaving it smaller. What I have is a small piece of Lyn Idwall. (CF works also). It is harder than any other hone I have and works wonderfully as a slurry stone, as slurry is only generated from the hone itself, not the Lyn Idwall being so much harder. The piece of Lyn Idwall is like glass. It works nicely on coticules, Thurinigans, Silkstones and Yellow lake.