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I think if you were to go with diamond plate you might down grade the hardness at least a notch.

A tool can gouge the surface readily. so it is a lot softer than a novaculite. My initial...

I have sent him messages at different times and not responded to. I thought he was mad because i said the eye of the hammer he sold me was crooked:)
you can also try writing to fujibato ( i tink...

I guess you can rub it off anyway you like. The one i got from nakaoka-san was sealed. Just remember to seal it when you finish finishing of the edges.

These are great stones to finish the sides...