A diamond drop-shaped cluster ring

A diamond drop-shaped cluster ring, an old pear cut diamond rub set to a plain collet, bordered by an open-work surround further set with graduated old cut diamonds, into a grooved tapering hoop. Band tested as approximately 18ct gold, 2.77g Principal diamond assessed as: Colour J/K Clarity: SI Ring size M Buying this diamond ring at auction could save up to 0.42 tonnes of CO2e compared to buying new. Condition Report: Old pear cut diamond measurements 6.5 x 4.4 x 3.81. Roughly estimated as 0.65 - 0.70, but the cut is uneven and limits a correct estimation. Areas of darkening around the setting. Surface scratches and marks to mount. Inventory numbers engraved on the reverse.