Possible Coro based on the patent on the back. Pat 19303 is registered to Phinney and Fuller which was used by Adolph Katz of Coro for dress clips.

This unsigned 1930's Fruit Salad Dress Clip is a vintage piece with a vintage flair. Measuring 1.25”x 1.75”, this multicolor crystal dress clip exudes elegance and charm. The possible Coro branding adds a touch of luxury and sophistication to any outfit, making it a standout accessory for those who appreciate vintage jewelry.