HIGH DOMED FLOWER with Sapphires and Blue Cabochons Brooch top

Gorgeous Boucher like brooch all done on brilliant gold plated metal. Three petals at top in a pinwheel form with large blue round Cabochon in the center with sapphire blue chatons at ends of petals. Eight petals curving down into a dome shape, between each petal is either three blue cabochons or three sapphire blue chatons. Measuring 1 1/2” diameter by 1” high. This really looks to be Boucher or we'll done designer. There is a number 53 stamped on the top inside. ABSOLUTELY BREATHTAKING!