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Eschers are the easiest naturals IMO. Jnats are a little more work but there are more possibilities with a nagura set. The list goes out the door and around the block. Cotis, thuringians, Zulu grey,...

I have one. They vary a bit in grit so it could be 8k or could be 12k. That inconsistency is evident in all natural stones. Slurry works great with natural stones including this one. I used a diamond...