18ct gold, opal and diamond pendant necklace, the flexible serpentine link collier decorated to the front with a plaque pave-set with brilliant-cut diamonds suspending to the centre a pear-shaped opal stated to weigh 8.48 carats framed by brilliant-cut diamonds surmounted by baguette diamonds, the diamonds together stated to weigh 4.31 carats, gross weight approximately 40.86 grams, length approximately 400 mm, French maker's marks.