Ostertag Art Deco Emerald and Diamond Brooch

Wonderful Art Deco Diamond and Emerald brooch from the 1930's, set in platinum by Ostertag, France. This lovely design is very reminiscent of Coco Chanel's logo who was his neighbor in the period, where he was located at 16 Place Vendome. Conjoined "C" motifs are are laid with a ladder of diamond baguettes edged with round stones terminating in 2 large diamonds (over 1 carat each) on one end and large fluted Columbian teardrops with tiny pave ball caps on the other. Really exceptional quality and design from 1930's France. Ostertag pieces are exceptionally rare and have the highest quality gems and workmanship c/o the Rubel Freres workshop. 10.5 carat total, Signed Ostertag, France (see last images). 2.65" x 1.75" Acknowledged as one of the best makers of Art Deco jewellery and famously associated with Van Cleef & Arpels, Rubel Frères was a Parisian manufacturing firm that also worked with other well-known companies on the Place Vendôme in Paris, including Ostertag. Originally from Budapest, Jean (later John) and Robert Rubel were highly skilled jewellery designers whose claims to fame included two identical diamond and emerald cuffs designed in 1928 and purchased by Singer sewing machine heiress Daisy Fellowes; and the Grand Prix-winning Egyptian Revival bracelet for Van Cleef & Arpels, which was created for the 1925 International Exhibition of Modern and Industrial Arts in Paris.