[Jewelry making - Article 00301] - Re: [Orchid] Naming gem materials

[Greg DeMark]

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Peter,

    I think the confusion here is in knowing the difference between
    hardness and toughness.  Sapphire is hard and will not scratch by a
    steel burnisher. But it can chip, especially if it has been heat
    treated.  The small marks that happen from careless setting are
    actually a series of small chips. If you took the same burnisher and
    ran it across the table of the sapphire that chipped along the facets
    above the bezel you would find that it will not scratch. 

Greg DeMark
greg AT demarkjewelry.com
www.demarkjewelry.com
www.outdrs.net/~demark


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