Brooch plate in platinum (850 thousandths)...

Brooch plate in platinum (850 thousandths) of rectangular shape with openwork and geometric decoration, centered of an emerald cut emerald in a paving of diamonds cut in the old fashioned way, in figure eight and in pink. Safety chain. Circa 1930's period. Case.
Gross weight : 24.8 g. Length: 6,5 cm