the geometric design of elongated rectangular form with flared anthemion shaped ends and central square cluster upon a parallel lines, pierced and openwork featuring a central oblique square cut diamond to a cut-corner frame of square and circular cut stones, the twin lines channel set with square cuts supporting ladder style a six spaced old round brilliant cut diamonds, edged linear black enamel detail, mounted in platinum and with white gold fittings, signed 'J. MARCHAK PARIS' and numbered 1247, French assaymark and possibly partial workshop mark, approximately 9.50cts of diamonds in allLength 8.2cm / 3ΒΌ''
Width 1.7cm / 11/16''Weight: 18g
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