18ct gold, gem-set pendant and pearl necklace, designed as a torsade of seven strands of approximately 5.00 to 5.50 mm round cultured pearls centring an open work bolt ring clasp between bell-shaped connectors accented with brilliant-cut diamonds suspending a drop-shaped boulder opal framed by an open work celestial motif surround decorated at intervals with diamonds, circumference approximately 460 mm, pendant approximately 60 x 35 mm, detachable