Necklace with fine boulder opal and diamonds of total approx. 0.2 ct,

Necklace with fine oval boulder opal 2.7x1.2 cm, vivid green colouring and brilliant-cut diamonds totalling ca. 0.2 ct, good colour and clarity, 14K yellow gold, 38.6 g, L: 37 cm, late 20th century, minor signs of wear, handcrafted setting with backwards engraved maker's initials including small diamond with chain in solid workmanship with producer's mark.