What does 14K SFG mean on a necklace?

14K SFG on a necklace indicates that the necklace is made of 14 karat gold with a specific type of gold finish called "Satin Finish Gold." The "14K" refers to the purity of the gold, with 14 karat gold being 58.3% pure gold. The "SFG" specifies the type of finish applied to the gold, giving it a satin or matte appearance rather than a high polish.