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Perhaps they aren't present in shops of Japan. But they are used.
http://straightrazorpalace.com/hones/68689-shigefusa-his-whetstones.html. Not for razors.

To sell you the Goldfield?:rofl2:

The stone doesn't do scratches or a chip on an edge

It has golden gloss. Who knows, what except quartz can give gloss?

Hi guys! In mine Janat there is a quartz ( in suji ). What to do with a stone?
179665