Brooches : GILLOT & CO, Art Deco Diamond, Sapphire and Black Opal Brooch, 1920s. #ArtDeco #… 28 May 2018 3617 Brooches : GILLOT & CO, Art Deco Diamond, Sapphire and Black Opal Brooch, 1920s. #ArtDeco #Gillot #brooch