This brooch is such a beauty, it's rhinestones are so unique in color. Normally, as the saying goes, "purple and green should never be seen." However, this distinctive brooch is staggering in appearance! It's an original piece and not a dupe/knock off, as the pin is soldered into place, not glued!
See this page here to further read about faux vs real vintage costume jewelry: https://www.costumejewelrycollectors.com/vintage-costume-jewelry-research/designers-manufaturers-and-styles/identifying-delizza-elster-juliana-jewelry-101/
