Necklace - unique - with 20 green tourmalines,

Necklace - unique piece - with 20 green turmalines, rectangular step cut, ap. 5 x 4 mm, 60 citrines, rectangular, square step cut, ap. 5 x 4 and 5.5 x 5.5 mm, 14 K yellow gold, 155.7 g. L: 45 cm, D (links) ca. 18 mm, double box clasp hidden in round link, 2nd half of 20th century, minimal signs of wear, elaborate handcraft, stones should be re-set.