Art Deco 
An art deco chalcedony, onyx and diamond sûreté pin, circa 1920 The oval pierced and millegrain-set single-cut diamond plaque with central onyx bar and green chalcedony surmount, to a polished pin with a single-cut diamond finial, diamonds approx. 1.10ct. total, numbered, French assay marks, length 7.9cm.
An art deco chalcedony, onyx and diamond sûreté pin, circa 1920 The oval pierced and millegrain-set single-cut diamond plaque with central onyx bar and green chalcedony surmount, to a polished pin with a single-cut diamond finial, diamonds approx. 1.10ct. total, numbered, French assay marks, length 7.9cm.
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