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Interesting, seems to contradict the above statement. But, just goes to illustrate that a stone is a stone, not a mass produced tool.
My Koma is orange streaked, and it slurries very easily and cuts...

Found this on a Japanese tool website:

All pictures in the original post are Betsujyou, I think.

I don't see any reason why you couldn't. JimR wrote a nice blogpost (The 102nd Way to Skin a Cat (Kamisori Honing again) | Eastern Smooth: The Blog) about the wide range of techniques people use to...

Just to resurrect an old thread for my own clarification: the grades are purely aesthetic designations? All three of my lower nagura are (別上) though the Mejiro is noticeably more gray and patterned....