Necklace with 3 brilliant-cut diamonds and 7 octagonal diamonds

Necklace with 3 brilliant-cut diamonds and 7 single-cut diamonds totalling 0.25 ct (engraved), good colour and clarity, some chipped, 14K yellow gold/white gold, 12.6 g, polished/satin finish, L: ca. 41.5 cm, W: ca. 0.16 - 0.9 cm, 2nd half of the 20th century, minimal signs of wear.