Tutu ring In 18K (750) yellow gold and platinum set with a round faceted sapphire in an undulating diamond setting. hallmark: flat, 750, crown, R 1, hallmark illegible finger size: 53 (US: 6 ) diamond, total estimated weight: 0.45 ct approx. sapphire, estimated total weight: approx. 1.50 ct weight: 4.4 g