It has a makers mark but I can’t see the definition of it to know what it is. The setting is 10k gold. It is decades upon decades old. It is very dirty inside and needs cleaned, but I don’t want to mess it up. Size shown in photos. This vintage ring boasts a stunning blue stone that is believed to be sapphire. The intricate 10K gold setting is truly a work of art, and adds to the overall beauty of this piece. The ring is available in a size as shown in the photo and is perfect for any occasion. Whether you are looking for a special piece to add to your collection or a unique gift for someone special, this vintage ring is sure to impress.