What does PL18K stamped on one side and 750 on the other mean?

The markings "PL18K" and "750" indicate that the item is made of 18-karat gold, with "PL" likely denoting a specific alloy or manufacturer. The "750" stamp also confirms that the gold content is 75% pure, which is standard for 18K gold. Together, these stamps signify the quality and composition of the jewelry or item.