AN ART DECO BLACK OPAL, RUBY AND DIAMOND BROOCH, CIRCA 1935. The brooch set with an oblong opal weighing approximately 10.00 carats, to a stylised surround set with circular-cut diamonds, highlighted by square rubies, the diamonds together weighing approximately 1.50 carats, mounted in platinum. #ArtDeco #brooch
MARCUS & CO. BLACK OPAL, DIAMOND PLATINUM RING Oval Australian black opal cabochon, 22.9 x 14 x 4.77 mm., 8.87 cts. by formula, red-orange/blue-green spectral play-of-color, in Art Deco platinum setting, diamond shoulders. Marked Marcus. Size 5 1/2. 5.0 dwt. In Marcus box. Probable gem source: Lightning Ridge. Companion to lots 2534 and 2535.
Edwardian Black Opal, Demantoid Garnet, and Diamond Pendant, bezel-set with an opal tablet measuring approx. 16.45 x 11.80 x 2.17 mm, framed by demantoid garnets, old single, and old European-cut diamond melee, seed pearl bail, platinum-topped gold mount, lg. 1 3/4 in.