An exceptional Edwardian Columbian emerald and diamond three stone ring set in pierced openwork platinum. The unusually vibrant cushion cut emerald is flat claw set between a pair of Old Mine cut diamonds. The hand sawn pierced openwork undercarriage is a naturalistic and free flowing example of the Art Nouveau influence on Edwardian platinum work. Columbian emerald weight: 1.41cts. Estimated diamond weight: 0.66cts, 0.68cts. Assessed diamond colour: I-J. Assessed diamond clarity: VVS-VS