The diagonal line on the shobudani is not an inclusion. It's part the stone matrix itself. It is the stone itself, therefore it isn't harder than the other parts of the stone.

Both are razor stones, based on my own use and that of Alex Gilmore when he sold them to me. They work on Kamisori just as they do on straight razors. They are both harder, more gray toned stones, which is more apparent when they are dry.

I will post pictures of a homed Kamisori later tonight, as well as split hair pics. I can't seem to be able to upload pics on the mobile forum website.