the cut-corner rectangular onyx panel of low dome form, topped by a French-cut diamond between diamond line straps extending down the shoulders, the small diamonds of old round brilliant cut, millegrain set and to the onyx collet edge, pierced galleryLength 1.4cm / 9/16''
Width 1.3cm / ½''
French cut diamond 5.45 x 5.40 x 4.45mmWeight: 6g
Art Deco diamond and rock crystal panel brooch by Boucheron, Paris, of geometric design formed of stepped overlaid polygonal crystal and diamond panels, the larger crystal septagon panel base topped by a pave diamond hexagon and a crystal pentagon, all pierced through and with diamond geometric join pave set with baguette and round brilliant cut diamonds, mounted in platinum and white gold to the hinged clip to back, this signed 'Boucheron Paris', with French assaymarks and indiscernible workshop mark