1. An Art Deco Diamond Set Brooch An Art Deco diamond set brooch, of rectangular shape with corners cut away, with an openwork pattern comprising of a central, round brilliant-cut diamond with an estimated weight of 0.35 carat, with a baguette-cut diamond to the top and bottom of the rectangle, total estimated diamond weight 4.5 carats, all mounted in platinum, circa 1920, measuring approximately 4.4×2.2cm, gross weight 11.4 grams. An Art Deco Diamond Set Brooch An Art Deco Diamond Set Brooch An Art Deco Diamond Set Brooch Kate Middleton memakai An Art Deco Diamond Set Brooch Embed from Getty Images