Sparkling little rosette pin or brooch, 1 1/8" across. It has an inner ring of purple faux amethyst alternating with costume seed pearls. The outer loops or petals are set with clear rhinestones.
The gold tone setting shows no tarnish and may be a gold wash. The small rolling clasp works perfectly. A few of the outer rhinestones have darkened a little on the edges, but all the stones are present and bright.
I date this pin from about 1940, perhaps a bit earlier.