An old-cut diamond cluster ring

An old-cut diamond cluster ring, the ring set with a central old-cut diamond weighing 0.8 carats, claw-set to the centre of an open-plaque octagonal diamond-set mount, all millegrain-set to a tapered square-section shank, hallmarked platinum, London 2014, bearing the Bentley & Skinner sponsor mark, gross weight 3.80 grams,

No. X27548V