Unique necklace with pendant/brooch with fine opal approx. 10.5 ct

Unique necklace with floral pendant/brooch with fine opal 38.7x11.3 mm and 4 brilliant-cut diamonds totalling ca. 0.08 ct, in organic stick necklace L: 52 cm, pendant/Brooch 8x5.3 cm, 18K yellow gold, 44 g, 1990s, very good condition, very nice workmanship.