[Jewelry making - Article 00009] - Re: [Orchid] Disappearing diamonds fired in PMC

[Mary Ellin D'Agostino]

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    When soldering or casting diamonds in place, the high temperatures
    are only held for short periods of time in a reduction atmosphere.
    When firing diamonds in PMC Standard, the temperature is held at
    1650 for 2 hours in an oxygen rich environment. Diamonds do not
    survive this--they burn up in the kiln. When using the 3rd generation
    of metal clays (the low fire clays) and firing at a 10 minute firing
    schedule, reports indicate that diamonds will survive--whether the
    people reporting this have examined the diamonds closely for damage
    is unclear. 

Mary Ellin D'Agostino, PhD
www.medacreations.com
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