This is stamped on the inside of the ring on top, but it’s not legible. It has been tested though, and it is sterling silver.

This sterling silver charm pendant is a stylish addition to any jewelry collection. The letter "R" has been intricately crafted to create a traditional charm design. The charm is made of 925 silver with a 3.7-gram weight and measures 16mm in length. It can be easily added to a bracelet or necklace to personalize your jewelry. The silver metal gives it a classic look that can be worn for any occasion.