[Jewelry making - Article 00530] - Re: [Orchid] Disappearing diamonds fired in PMC

[hans]

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Dear Mary Ellin D'Agostino

>     The reports of the diamonds burning up in PMC were fired at 1650F
>     (900C) for 2 hours. This is the firing schedule for the origninal
>     (Standard) PMC. The question is not whether the temperature alone
>     is an issue, but the amount of time spent at temperature. How long
>     did you leave the diamond at 900C? 

    The time spent at 900C was indeed two hours. I have since corrected
    my web for that omission. Thank you for pointing it out. I added two
    more pictures of the diamond after being heated up for five minutes
    at an elevated temperature. These suggest that temperature does play
    a significant role. 

    http://tinyurl.com/2p3zoh 

    Also,for the greater good of all PMC artists trying to create fine
    jewellery, I cooked the diamond at 900C under a vacuum for 45
    minutes. Good news! Nothing happened. 

    So I still am of the opinion that, even though it's not very clever
    to heat diamonds to 900C, it is doubtful they would actually
    disappear completely. Damaged, yes. Gone? No. 

I hope this helps you,
Hans Meevis
http://www.meevis.com
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