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It is not a stone, it is a Diamond Plate. The diamonds are attached to the plate. If you clog the diamonds with grit and use pressure, like when lapping a hard stone, you will rip out the diamonds.
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Yup. Not a finishing stone. It is probably a 1500 grit Diamond Plate. The diamond used were 1500 grit, measured with a screen. A finishing stone for razors, would be 8,0000 to 30,000 grit. To lap...