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Apples and oranges, my friend. A synthetic stone puts a different edge on a blade than a natural stone, maybe 30k synthetic is unpleasant but 40k+ natural is wonderful.

Then again, I don't have...

Chocera and Japanese Natural Stones .... - Foodie Forums

There's a guy in there that mentions having the Chocera hones, but not the 10k. Some of the other guys talk about other people's...