Naniwa Diamond (Diamond Pro)

Diamond

No particle size in microns is published for this line. The values are our estimates from secondary sources, so the marks are faded and the spread is unknown.

Each grade below shows its size in microns, its spread (the published distribution, where a maker or standard gives one; most makers publish none), and where that size lands on the reference scale, a shared yardstick for reading grit numbers across makers.

Particle sizemicrons, log

302010532

coarserfiner

inkmeasured or standardmaker figureour estimate

shapeknown distributionpoint, spread unknown

#400Our estimate

Naniwa

30 µm

C-estimated from JIS #400 (matches Naniwa Chosera 400 community value).

spread not published · reference scale about #400

#600Our estimate

Naniwa

20 µm

C-estimated from JIS #600 (~18-20 micron on the waterstone scale).

spread not published · reference scale about #600

#800Our estimate

Naniwa

14 µm

C-estimated from JIS #800 (matches Naniwa Chosera 800 community value).

spread not published · reference scale about #800

#1000Our estimate

Naniwa

11.5 µm

C-estimated from JIS #1000 (~11-12 micron on the waterstone scale).

spread not published · reference scale about #1000

#3000Our estimate

Naniwa

4 µm

C-estimated from JIS #3000 (matches Naniwa Chosera 3000 community value).

spread not published · reference scale about #3000

#6000Our estimate

Naniwa

2 µm

C-estimated from JIS #6000 (~2 micron on the waterstone scale).

spread not published · reference scale about #6000