An impressive South Sea pearl and diamond necklace, composed of a line of 29 graduating Australian cultured pearls measuring 13.7 mm to 18.0 mm, completed by a ball clasp pave-set with brilliant-cut diamonds, the front supporting a detachable enhancer pave-set with brilliant-cut diamonds terminating in a swing drop centring an off-round cultured pearl of grey tint measuring approximately 16 mm surmounted by a bell cap pave-set to the front with near colourless diamonds the reverse similarly set with black diamonds, the near colourless diamonds and black diamonds together weighing approximately 3.99 carats and 0.55 carats, respectively, mounted in 18ct white gold, inner circumference 460 mm. Please note that the black diamonds have not been tested for natural origin of colour.