What does 14K PST mean on a gold ring?

The marking "14K PST" on a gold ring indicates that the ring is made of 14 karat gold, which contains 58.3% pure gold and 41.7% other metals. The "PST" could refer to a specific manufacturer's mark or a designation of the type of gold alloy used, though it's not a standard term. It's essential to verify the meaning with the jeweler or manufacturer for clarity.