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This speculation is flat out not possible. A ceramic hone is man-made. No company "makes" the Chinese Hones as it is a natural stone. It isn't made, it is simply mined and cut.

As far as the...

1/8" is an estimate. Basically you lap it to flat and then try it. If the hone feels gritty, then you need to lap some more. Trial and error is going to work better than a ruler!

The Chinese...