Is this a blue topaz? An aquamarine? We really don’t know. What we do know is that there are a couple of markings inside, and the ring is so old that they are too worn to be legible. However, the sterling silver band and face look great. All the marcasite is present and there are no bends to the shape of the piece. The blue stone is brilliant and changes color depending on the light. Also, even though it is a full bezel set, it is one of those high settings with the openings underneath to allow in light, this makes the huge stone – a full inch long by over half an inch wide – really sparkle. This is a truly well made piece of jewelry from back in the day when jewelry was made by hand. Comes with a Certificate of Authenticity from Estate of Rue.