Mellerio, a gold and diamond brooch, France, mid 20th century, designed as a flower with five

Mellerio, a gold and diamond brooch, France, mid 20th century, designed as a flower with five articulated openwork petals, the centre claw-set with brilliant-cut diamonds each mounted en tremblant, mounted in gold, length 6.5cm, signed Mellerio Paris, numbered 229080, French assay marks for 18ct gold and platinum, partial French maker's mark, French patent mark Bté SGDG