Emerald and diamond ring In silver and 18K (750) yellow gold set with an old-cut diamond surrounded by a row of emeralds and a row of old-cut diamonds, forming a stylised octagonal motif. hallmark: none finger size : 55 1/2 (US : 7 1/4 ) diamond, estimated total weight: approx. 0.40 ct emerald, estimated total weight: 0.25 ct approx. weight: 3.6 g