goldtone & rhinestone CORO brooch

About 2-1/4" at its longest, this goldtone brooch features pale yellow and darker amber colored rows of rhinestones set in a kinda vines/leaves design. Quite sparkly, the CORO name is stamped on one end of its clasp on the back. From an estate lot, I don't really know how old it is but will guess 1970's?? It is contained in a Marshall Field & Co. branded box but I also don't know if it came from that famous department store.