Adler. A cultured pearl and diamond choker, a central pierced brilliant cut diamond set plaque, or plaque de cou, to twelve rows of cultured pearls, 2.5 to 3mm in size, with plain and brilliant cut diamond set spacer bars, to diamond set clasp, stamped PT, signed Adler, length of plaque 4.5cm, length 32.5cm, with a section of spare cultured pearls, and Adler pouch