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<p>[QUOTE=&quot;Michael K, post: 25594490, member: 78298&quot;]Alurid is correct. 31.1 grams per troy ounce.</p><p>Copper is weighed at 28.3495 grams per ounce. But gold, silver, platinum, is</p><p>always troy. Because in the old days you get a more exact measurement when you break troy down into 20 penny weight per troy ounce. There are 24 grains per pennyweight, which can be further divided into half pennyweight, quarter penny weight, even 1/3 penny weight. Since gold is so valuable you can get a more exact measurement by using grains. They use grams today and it&#039;s a little sloppier as that fractional amount is rarely used, and the gold guys use 31.1 grams.[/QUOTE]</p><p><br /></p>

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