Art Deco 
AN ART DECO DIAMOND, COLOURED DIAMOND AND ONYX BROOCH, BY OSTERTAG Designed as two shield-shaped openwork diamond-set motifs, each centering upon a pear-shaped cabochon onyx and gathered by a yellow cushion-shaped collet-set diamond on a diamond bombé connecting link, circa 1925, 7.2 cm, with French assay marks for platinum and gold Signed Ostertag France
AN ART DECO DIAMOND, COLOURED DIAMOND AND ONYX BROOCH, BY OSTERTAG Designed as two shield-shaped openwork diamond-set motifs, each centering upon a pear-shaped cabochon onyx and gathered by a yellow cushion-shaped collet-set diamond on a diamond bombé connecting link, circa 1925, 7.2 cm, with French assay marks for platinum and gold Signed Ostertag France
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