Hardness of other gem minerals...
by Mr Wednesday (2012-12-29 22:22:34)
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  In reply to: That may be why they are standard  posted by ndtnguy



Rubies and sapphires are corundum, which is the next hardest gem mineral to diamond. Only silicon, titanium, or tungsten carbide is as hard (aside from a few substances that I doubt would be likely to be encountered).

Emeralds are beryl, which has a relative hardness of 7.5 to 8. They might be damaged by hardened steel or a couple of other minerals.



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