An 18ct gold gentlemen's single stone diamond ring, An 18ct gold gentlemen's single stone diamond ring, with an old European cut diamond, estimated as approximately 0.48ct, four claw set to an open collet, split style shoulders to a tapered shank. Import hallmark London 1980. Head 7.30mm, 4.76g. Finger size T Buying this second-hand gemstone ring could save up to 0.42 tonnes of CO2e compared to buying new. Condition Report: Italian standard mark. Diamonds bright and lively. Light surface marks commensurate with its age.