Cartier, onyx, ruby and diamond 'Agrafe' necklace, 18ct white gold, pave set with fine round brilliant cut diamonds, pendant pave set with round brilliant cut diamonds and two fluted black onyx beads with terminating cabochon cut rubies, set with a concealed box clasp, signed 'Cartier, 750', with Cartier box and certificate, length 37 cm, total weight 40.5 grams