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Lady’s seed pearl, onyx and diamond fob watch, 1920. The cut-cornered rectangular dial applied with Arabic numerals, signed Weinberg, the reverse decorated with onyx and single-cut diamonds, to a seed pearl mesh chain and brooch, accented with single-cut diamond panels. Via Sotheby’s.

Diamond and onyx circle brooch, Cartier, Paris, circa 1925 - The circle formed of two curved segments of onyx, enclosing scrolls of old European-cut and single-cut diamonds, the terminals with decorated with single-cut diamond bands, mounted in platinum. | © 2015 Sotheby’s

Winter Sale Big Diamond Bow Pendant Brooch Silver 18K Rose Gold Victorian Antique Jewelry

Art Deco Platinum, Diamond and Sapphire Brooch, Cartier. The openwork tapered oval brooch topped by one square-cut sapphire, accented by 3 diamond-shaped sapphires spaced by 2 round sapphires, set throughout with 66 old European and single-cut diamonds, and 4 rose-cut diamonds, circa 1920.

ART DECO ONYX AND DIAMOND PIN, CARTIER, CIRCA 1925. The first a jabot pin designed as an arrow, set with a modified triangular segment of onyx as well as with old European-cut and single-cut diamonds, mounted in platinum, signed Cartier, numbered 1442 and 1535; signed Cartier.