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I read somewhere that a saphire crystal can only be scratched by a diamond, or an emory board with diamond particulate embedded in it.
Am I to understand that man-made materials like a carbon-steel blade knife cannot scratch it's surface? Or is the Moh's hardness scale; which rates a diamond at "10" and a saphire as "8 1/2" (I think that's right,) referring to naturally-occuring minerals only?
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