This seems to be older, even for a vintage piece. It's by Coro (no copyright mark) and is done in goldtoned metal. A slender crescent sparked with tiny turquoise rhinestones arches over a large rhinestone flower (perhaps?) made of clear chatons surrounding a very large turquoise center. It measures about 7/8" in diameter.
This came from an estate where some of the jewelry dated back to the 20's and 30's; I would guess this is later...perhaps the 40's (because of the logo)? It's in good shape although the enlarged camera shots show a difference in one tiny rhinestone...more than likely replaced somewhere in its life.
This is a dainty little pin...just the right accent for a feminine blouse or dress.