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
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