Awase-to, or Awase-do are the much heralded finishing stones. They are harder and finer than Ara-to and Naka-to. Stones from Suita stratum are not classified as Awase-do, even when they are hard and fine enough to finish the edge of a straight razor.

Awasedo are, for the most part, from the Tomae, Namito or Aisa stratum. Generally, they will be layered, hard, fine, and very consistent in structure, grain size, and particle distribution.   

© Keith V Johnson 2014 - 2018