'Heart' choker and pendant with fine emerald and 5 brilliant-cut diamonds

Choker and pendant 'Heart' with fine emerald and 5 brilliant-cut diamonds totalling ca. 0.60 ct, ca. RW (F-G)/VS, emerald-cut emerald ca. 0.70 ct, ca. 6.3 x 5 mm, very fine colour, probably Brazil, pendant: 18K yellow gold, 14.6 g, ca. 34.7 x 28.1 mm, choker: 26-fold spiral, blackened stainless steel, clasp 18K yellow gold, 5.1 g, L: ca. 42 cm, W: ca 0.16 cm, total weight: 19.7 g, 21st century, minimal signs of wear, with hallmark, goldsmith's handcrafted work.