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Fair enough!

I can't show you the official list, but Naniwa assures me that this information follows JIS standards.

And as far as Naniwa Kenma knows.

Every Japanese stone above 8K is based on in-house determinations, not on any external standard. This is straight from a representative of a Japanese waterstone...

CrOx is .5 Micron. So that means it's roughly the equivalent of a 30,000 shapton (.49m), or 8000 JIS Sandpaper...

I'm not sure where you got 60,000.

And, just for the record, the JIS only goes...