The pin has a ballet dancer en pointe with a prong set carved cabochon ruby. The dress has prong and star set ruby, sapphire, and diamond accents and a ruffled hem defined by prong set sapphires.
The brooch has a single locking pin stem and is stamped 14K.
There is a chip to the cabochon ruby and multiple accent stones have chips and nicks visible under magnification.
Likely circa 1940s.