Pearl necklace with gemstone-studded centerpiece,

Necklace made of white akoya cultured pearls, D: c. 6.5 - 7 mm, fine luster, centerpiece set with pink fac. tourmaline, opal and diamonds of different cuts, totall. c. 0.30 ct, good colour and clarity, YG 18K, totall. 45.0 g, l.: 58 cm, 20th/21st century, tourmalin clearly abraded.