Size 10.75 Sterling Silver 925 Ring With Blue Sapphire Stone

Unique and collectible vintage ring. Sterling silver with one round blue sapphire stone on the side. Not sure the stone is heated or treated in any other way, but natural untreated sapphires of this size were quite available in the past. Size 10.75 Stamped SS (meaning 925 sterling silver) and has an RBC logo on one side.