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Yup, my 103 works just fine after lapping. I would steer clear of diamond plates with any hard stone - whether natural or synthetic. Loose grit lapping with SiC is best for very hard stones.

By 102 do you mean a Carborundum? You can lap those, they are homogenous being made of silicon carbide. Very important to smooth them afterwards though, they are formed from fairly (relative to a lot...