A BELLE EPOQUE DIAMOND AND AMETHYST DEVANT-DE-CORSAGE, BY CARTIER   Designed as an old-mine cut diamond pierced bow, with collet diamond aiguillettes, gathered by a circular-cut amethyst suspending a diamond ribbon drop with cushion-shaped amethyst terminal (amethyst probably of later addition), circa 1918, in a Cartier red leather case  Signed Cartier, London, Paris, New York
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