NIESSING spiral bracelet with 3 thread elements,

NIESSING omega necklace with 3 pendants of which 2 spheres with brilliant-cut diamonds, 1x 0.2 ct, ca. TIN (M)/I1 and 1x 0.15 ct, ca. WEISS (H)/SI, 18K yellow gold and platinum, 13.6 g, L: 44 cm, late 20th century, signs of wear, marked 'GK', including sale receipts.