An onyx diamond and emerald necklace; set in 18ct white gold in the Art Deco style with a hexagonal onyx plaque applied with an oval cabochon emerald of approx. 1.06ct and 144 round brilliant and single cut diamonds with emerald bead drop to chain of 5 mm round emerald beads and 13 mm long cylindrical onyx beads with x frame plaque set with 17 round brilliant and single cut diamonds. 161 diamonds total approx 0.80ct