Two row pearl necklace, clasp set with zircon and diamonds,

2-row necklace made of white cultured pearls, d.: ca. 4 - 8 mm, clasp set with blue round faceted zircon ca. 8.0 ct, brilliant-cut diamonds totalling ca. 0.9 ct, ca. TIW (K)/VVS-VS, total weight 67.7 g, l.: ca. 85 cm, 2nd half of 20th century, good condition.