Vintage Coro 1930's-1940's Duette Brooch / Dress Clips

This is a well loved duette pin which converts to separate dress clips by a patented Coro mechanism from 1931. The patent and trademark are both stamped on the back of the duette frame. Coro Duette in script and PAT. No. 1798867. The design is set in a silver colored metal,  but is not marked sterling. The bright smooth finish leads me to believe it is rhodium plated  gold gilt on the front surface. I believe the flower to be a nodding trillium. The flowers are pave set with clear rhinestones with most having darkened to some degree. None are missing. The gold gilt leaves are convex and are perforated where the vein would be. The high points of gold finish are worn. A single sapphire blue glass navette rhinestone is set at the base of each stem. The tips of the stems have gold finish wear. All the attachment mechanisms are in excellent visual and functional condition.