Early 20th Century 18ct Gold & Platinum, Emerald & Diamond Ring (863W Early 20th Century 18ct Gold & Platinum, Emerald & Diamond Three Stone Early 20th Century Edwardian emerald and diamond ring. Bell and Bird Early 20th Century Platinum, Diamond & Emerald Cluster Ring (304Y. A charming ring dating from the early to mid 20th century, beautifully crafted and full of period character. The centrepiece is a vivid bright green, cushion shaped emerald measuring 4. 2 4. 2 mm (estimated 0. 20 carats), delicately millegrain set. Flanking the emerald on each side is an old brilliant cut white diamond, each approximately 3. 6 mm (estimated 0. 15 carats), with an assessed colour of HJ and clarity SI, also millegrain set in platinum. The head of the ring measures 12 4. 6 mm with a depth of 3. 6 mm, giving a refined yet eye catching profile. The band tests as 18 carat yellow gold, with no hallmarks presentconsistent with jewellery of this period. Total weight: 1. 7 grams. Ring size: M. Complimentary resizing is available.