Naniwa Ocean Blue Stone

Those are not made by Naniwa.

They are made in China.

They are probably not 12000 grit.

That's probably not what you want or need.

But YMMV
 
Are we talking about this stone?
Natural "Ocean Blue" Sharpening Honing Stone Whetstone Waterstone Grit 12000
  • Natural "Ocean Blue" Tsushima sharpening honing waterstone with a matching nagura (slurry) stone
  • Used for honing and sharpening knives, chisels, gouges, razors, blades, planes; no pre-soaking required
  • Hard, very dense, uniform consistency of ultra fine grit; longer life cutting edge; high dish resistance, long lifetime
  • Quarried from a now closed underwater mine near South Tsushima Island, Japan; golden stamp of authenticity; very limited stock
  • 8.0"x2.7"x1.0" (200x70x25mm) +/- 3%; grit ~12000 (ultra fine); includes: genuine leather case, silicone anti-slip pad
 
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