What is fi 14k marking on diamond earring mean?

The "14k" marking on a diamond earring indicates that the metal used in the earring is 14 karat gold, meaning it is composed of 58.3% pure gold and 41.7% other metals. This marking signifies the quality and purity of the gold alloy used in the piece. The "fi" may refer to a specific manufacturer's mark or design, but it is not a standard term associated with gold or diamonds. Always check with a jeweler for precise identification of any markings.