Re: Waterstone vs diamond/ceramic
I like diamond hones for sharpening really dull knives that have a high Rockwell hardness. They are also great if you want to "rough sharpen" a knife. They leave nice microserrations that are good for sliceing things like tomatoes and meat. They are also good for reprofiling blades but I have worn out several lansky diamond hones (adapted to my GATCO sharpener) by reprofiling high Rockwell knives. One other thing I like about diamond hones is that they often come in small packages which makes them great for field carry.
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