An opal bead and rock crystal necklace, early 20th century, composed of two rows of graduated opal beads, measuring approximately 11.4 mm-3.3 mm, alternating with faceted rock crystal rondelles, the clasp mounted with an oval-shaped opal, measuring approximately 18.4 mm x 8.6 mm, within a millegrain single-cut diamond cluster surround, clasp mounted in gold, longer strand 54.5 cm, shorter strand 49.5 cm