I have a diamond stone I inherited from my wife's grandfather. I don't think it was ever used. While watching the little league game I did consistent, light strokes on the stone with my Grim Reaper blades. I disassembled the heads and did 5,3,1 stroke sequences on each blade. I was able to get them sharper than factory. I will be doing this from now on. It took just a few minutes and gave me peace of mind.