How many karats are there in pure gold?
The term karat (or carat) was coined to designate the quantity of gold in gold alloys. A 24-karat piece is made of 99.9% gold (which is considered pure gold), whereas in 18-karat there is 75% gold, and 50% in 12-karat. Another way of measuring gold purity is through the millesimal fineness, with values of decimal figures from 0 to 1, where 999 (or three nines fine) means pure gold.
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