The actual mass of pure gold in an alloyed chain depends on both its total weight and its purity (expressed in carats out of 24, where 24-carat is pure gold). The gold content is found by multiplying the total weight by the fraction (carat rating / 24).
The first chain weighs 18 g and is 22 carat gold, so its actual gold content is 18 x (22/24) = 18 x 0.9167 =...
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