[Jewelry making - Article 00135] - Re: [Orchid] Disappearing diamonds fired in PMC

[Jackie Truty]

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    When talking about gemstones, hardness (the ability of a stone to be
    scratched) is not the same as durability (the ability of a gemstone
    to withstand chemicals and chipping. At Mohs hardness of 10, a
    diamond is the hardest material on Earth, but it is not the most
    durable. Jadeite has exceptional durability, but only fair hardness. 

Jackie Truty
Near-graduate in GIA Colored Stones.
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