This is a 1930s Art Deco stylized floral basket brooch, rendered in baby blue moonglow glass cabochons and bright rhinestones, in rounds and baguettes. The pin itself is cast pot metal, with a rhodium finish on the front. Notice the black enamel around the edges, for extra definition.
Excellent vintage condition. There is some yellowing of some of the rhinestones, and one small rhinestone is missing, which will be replaced.