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As far as I could make out the statement of hardness always stands in comparison to other stones of its kind.
"My Coticule is fairly hard" could mean "For a coticule mine is fairly hard"

I don`t...

That is why I repeat: there is no definition of hardness of a stone. Why should there be?
What could be the benefit of a unified hardness system for naturals?

BTW I had very hard and very quick...

trust me, it is not that simple

That is right, but what about polishing? There is evidence that at high grit ratings, the grinding action (ie. removing steel) gets less important.
Tha major...