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You are wrong, in this case. Contact DMT and ask them yourself if you don't believe me. The diamonds certainly do dull and flatten or round over, over time. This is why the diamond plates slow way...

Worn diamond plates are better for stone surfacing. New diamond plates are bad news for harder stones but not such a big deal for softer stones since the softer stones will give up particles and...

Yes SiC loose grit is the way to go. I use it for all but the softest stones. Using it for the brunt of flattening work saves wear and tear on the diamond plates - which I still use on some stones...