Magnificent Brooch made in the Post-War 1960s...what a solid Gold Work

Based on the glamorous Art Deco era, this magnificent brooch was made in the post-war 1960s, solid gold work set with full-cut and octagonal brilliant-cut diamonds total approx. 0.55 ct, TW (fine white F) / VS (very small inclusions), four bright green-blue tourmaline baguettes total approx. 0.40 ct, eye clean, 1 piece l. dam., pierced mill handle decorated surface, weighing approx. 11 grams, made of 750 white gold, needle with safety clasp on the back, can also be converted into a pendant, very good condition,
dimensions of the brooch 65 x 8.5 x 6.5 mm, privately owned