What does rgp 10k mean on a pendant?

"RGP 10k" on a pendant stands for "Rolled Gold Plate 10 karat." This indicates that the pendant is made of a base metal that has been coated with a layer of gold that is 10 karats in purity. The rolled gold plating process gives it a durable finish, making it more resistant to wear compared to regular gold plating. However, it is important to note that it is not solid gold.