Opal and diamond necklace/brooch, circa 1910 of celestial design, the half moon-shaped black opal surmounted by a star motif accented with circular-cut diamond suspending an oval black opal surmounted by similarly set stars further suspending three lines of diamonds each terminating in an opal, completed by a trace link chain, brooch detachable, the opals together wieghing approximately 14.50 carats, mounted in 15ct gold, length approximately 500 mm.