A 9ct two colour gold, blue topaz and diamond ring, with a cushion cut sky blue topaz claw set to the centre, within an off-square surround of graduated round brilliant cut diamonds in white gold collets, to a plain yellow gold band. Head 18 x 18mm. Birmingham hallmark, 5.18g Ring size M½ Buying this gemstone ring at auction could save up to 0.42 tonnes of CO2e compared to buying new.