A fine early Victorian diamond detachable centrepiece set with an old-cut diamond surrounded by eight diamond-set petals, all within an ornate openwork scroll design plaque suspending an old-cut diamond drop, set throughout with old brilliant and rose-cut diamonds estimated to weigh 6.3 carats in total, strung to five rows of cultured saltwater pearls measuring approximately 5mm in diameter, with two early Victorian plaques to either side, each plaque centrally-set with an old-cut diamond surrounded by diamond-set scrolls cut-down set with old-cut diamonds estimated to weigh a further total of 7 carats for the pair, the diamonds set in silver to yellow gold mounts, circa 1840, the pearls strung to an old-cut diamond-set bayonet clasp, the total diamond weight of the necklace is estimated a