[Jewelry making - Article 00016] - Re: [Orchid] Diamonds getting Milky

[Jay Gaelen]

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Ganesh,

    The problem with your diamonds is that you are 'smoking' them. If
    you look at them closely, you will see that it is not a problem with
    reducing the grade but is a surface coating which is not removable.
    This happens when enough heat is applied to a diamond that it turns
    red. Diamonds can take quite a lot of heat as long as they are heated
    as well as cooled slowly. Uneven heating to this red stage will also
    cause internal shattering. 

    I have never tried casting in place but my guess is that: A) Your
    gold is too hot. Seems to me that to avoid rapid heating, you must
    have a very close tolerance between the temp of the mold and the
    temp of the gold. And B) You are trying to use large diamonds. I find
    that above say; 3 -3.5mm diamonds, they do not conduct heat evenly
    enough to avoid this.

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