What does 10 K FD mean on jewelry?

"10 K FD" on jewelry typically refers to the metal purity of the piece. In this case, "10 K" indicates that the jewelry is made of 10 karat gold, which means it is 41.7% pure gold. The "FD" could potentially be a manufacturer's mark or a designer's signature, but without further context, it's difficult to determine its exact meaning.