[Jewelry making - Article 00125] - Re: [Orchid] Casting with stones

[ShishirNevatia]

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Hi,

    An important point is that minimum wax (later transformed to metal)
    must hold the stone securely from the top and bottom to reduce heat
    transfer and keep open for good look. 

    If you do only small quantity, you may take the impression in wax.
    If the stone is over 2.5 mm, the net shrinkage of about 1/2 to 1%
    during casting -- expansion of investment and reduction of metal--
    matters. 

    Especially for larger stones, over 6 mm, you may not want to cast,
    but make only a good seat to help set in metal. It makes sense to use
    a Teflon tape below the stone and heat the stone with a small wax
    solder pen to get a good seat. Then, you may remove the tape, stone
    and clean the melted wax. 

    After casting, hardly any work will be needed to set. 

Regards

Shishir Nevatia
Sunjewels
Seepz Mumbai India 400096
Fax +9122 2829 0206 or
+9122 5691 9739

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