The man made stone is used after peening (new blades are already peened, but not sharp). It gives a good edge, but for grass mowing - you'll want the natural stone also.
The Natural stone is similar in hardness to an American 'arkansas black', and gives a surgical sharp razor edge. It is used in the field after 10-15 minutes of mowing, when you feel the blade start 'pulling' instead of 'slicing'.
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