Necklace in yellow gold and fine stones

18k yellow gold (750/1000) necklace. Geometric square pattern. Flexible link. Set with amethyst (total weight: 3.24 cts, 18 stones of approximately 0.18 ct each), citrine (total weight: 3.24 cts, 18 stones of approximately 0.18 ct each), peridot (total weight: 2.3 cts, 10 stones of approximately 0.23 ct each), tourmaline (total weight: 2.1 cts, 10 stones of approximately 0.21 ct each), garnet (total weight: 3.36 cts, 16 stones of approximately 0.21 ct each), topaz (total weight: 2.4 cts, 10 stones of approximately 0.24 ct each), and cordierite (total weight: 0.72 ct, 4 stones of approximately 0.18 ct each). Length: 38.5 cm. Width: 0.5 cm. Total weight: 39.65 g. Owl hallmark. Excellent condition.