Emerald, onyx and diamond necklace, composed of five lines of graduated rose-cut spheroid-shaped emerald beads decorated at intervals with spherical black onyx beads between white gold rondelle spacers pave-set with brilliant-cut diamonds, completed by an 18ct white gold open work box clasp embellished with diamonds, the diamonds together weighing approximately 2.90 carats, inner circumference 580 mm, gross weight approximately 93 grams, Italian workshop registration marks, UK import marks.