An Art Deco platinum and diamond brooch by Janesich, French, of openwork design, composed of overlapping panels and interlocking geometric shapes, each panel set alternately with baguette-cut or pavé round-cut diamonds, with pairs of square-cut and baguette-cut diamond accents at its extremities, mounted in platinum. Measuring 6.6cm by 3.4cm. Signed JANESICH and stamped with French assay marks. Circa 1930.