Do you know how to refine gold? How to Make 24k Gold Leaf? You'll see here the gold chain has been refining 24K pure gold.
Almost all gold jewelry is not 100% pure gold. Jewelry is usually made with 22 karat = 91.7% gold, 18 karat = 75.0% gold, 14 karat = 58.3% gold. But 100% pure gold is 24 karat. So I have shown here how alloyed gold is made into pure gold.
Declaration
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It has been done by professional goldsmiths.
Please do not try to do this at home.