Erte "Aventurine" Diamond, Black Onyx, Mother-of-Pearl, 14k Yellow Gold Necklace. Designed as a cameo, the octagonal gold center depicting the profile of a person, the shoulder neck and head carved in mother-of-pearl, the helmet featuring round-cut diamonds and suspending a tassel with one round-cut diamond, set in a 14k yellow gold mounting with black onyx border and further diamond accents, the obverse featuring an octagonal mother-of-pearl plaque, suspended from a 14k yellow gold chain, completed by a box clasp with figure eight safety, forming a 20 inch necklace. Accompanied by original Erte box. {Gross Weight: 36.6 dwts} Note: Back marked "9/250"