[Jewelry making - Article 00622] - Re: [Orchid] Copper to silver weight conversion factor

[John Donivan]

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    SG of copper is 8.8-9 in book, call it 8.9. SG of silver (I assume
    fine, but it's only an estimate) in book is 10.4-10.6, say 10.5,
    which is what we use for casting. Relationship is 1.18. Multiply
    copper weight by 1.18 to get silver weight. This is useful for all
    sorts of things, too. Divide the SG of 18kt by the SG of silver and
    it will tell you a number to figure the weight of a silver piece in
    gold, etc. 

http://www.donivanandmaggiora.com
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