In the US, jewelry must be at least 10 karat to be marketed as “gold.” Items which are not at least 41.7% gold are typically “gold plated”, which...
We measure in pennyweights (dwt), with an accuracy of +/- 0.1dwt. One pennyweight is equal to 1.555 grams, and there are 20 dwt in one troy ounce.
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