[Jewelry making - Article 00357] - Re: [Orchid] Naming gem materials

[Cap'n kirk]

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>      I think the confusion here is in knowing the difference between
>     hardness and toughness. 

    That's exactly right; since jade is so tough it can not scratch with
    a steel pin or knife. Emerald on the other hand, at hardness of 8
    will chip up the gazoo, looking much like a scratch, but not one.
    Nephrite, at 6 and 1/2 on the Moh won't chip OR scratch unless there
    are extraneous minerals present, which is invariably noticeable. 



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