Massive, heavy Medieval crown ring, with aqua and red stones, statement piece!

This amazing "kingly" Crown ring is incredibly detailed and well made, very medieval looking and is huge. Heavy Bronze setting, I know the stones are natural and genuine but unsure anymore of exactly what they are. The main stone is a variegated aqua and green and the surrounding stones are red (they may be coral or some other type of natural stone). The size is about 10.5 -11. Can also be worn around your neck on a chain. Measurements: 1.25" high x 1.25" wide.