What does 417 on a gold chain?

The number "417" on a gold chain indicates the purity of the gold, specifically that it is 41.7% pure gold, or 10 karats. This designation means that the chain is made of 10 parts gold and 14 parts other metals, making it more durable and suitable for everyday wear compared to higher karat gold. This marking helps consumers understand the quality and value of the gold jewelry they are purchasing.