21317 - Circa 1925 Art Deco Platinum Diamond Black Onyx Rectangular Brooch

Platinum Diamond Rose Diamond Black Onyx Art Deco Open-Work French Rectangular Brooch, Circa 1925, 2 1/2" X 1" 1 European Cut Diamond Est .35 CTS, 52 Diamonds Est 5.05 CTS, 109 Rose Diamonds, 10 Black Onyx