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I think you will find the best Chinese stones will have a uniform blue-grey, or green-grey color and will be very smooth to the touch, provided they have been lapped properly.

One test that I use...

I have two Chinese Guangxi stones, both from Woodcraft. I estimate that one of the stones is around 12K and can be used as a finisher. I estimate that the other is around 8-10K and is a good...