Pearl, diamond and gold pendant/collier de chien, Erich Frey, 1970s designed as a flattened collar, with an openwork frame centred by a brilliant-cut fancy yellow diamond weighing approximately 0.25 carats, suspending a hinged plaque of abstract design, composed of four segments set with shaped rods headed by pearls of cream and grey tint, the segments united by a brilliant-cut diamond weighing approximately 0.40 carats, later closing clasp, maker's mark