What does gold ring stamp 10 KN mean?

A gold ring stamped with "10 KN" indicates that the ring is made of 10 karat gold, which means it contains 41.7% pure gold and 58.3% other metals. The "KN" could refer to a specific manufacturer's mark or the type of alloy used, but it's not a standard designation for gold purity. Always check with a jeweler for precise identification and valuation.