Early 20th Century Edwardian emerald and diamond ring.Early 20th century Edwardian era emerald and old mine cut diamond five stone ring. The emeralds are set in 18k gold and the diamonds are set in platinum. English in origin. Old mine cut diamonds were cut for gas and candle light and omit a darker romantic sparkle. While the precision faceting of modern stones main objective is to refract as much white light as possible. A 19th century diamond was cut to preserve as much weight as possible and often