Antique Penannular Brooch with trumpet flower

I purchased this at an estate sale years ago and cannot find examples of any other brooch that have such detailed work. There are leaves, scrolls, and a calla lily or trumpet flower around the ring. It is not marked with any identification. There are also rhinestone or real stones set within flowers. I love this pin and would like to determine exactly how old it is. The brooch measures 1 3/4 inches from terminal to top and 1 3/8 inches other direction. The pin is 1 1/4 inches long and the pin head is a larger loop measuring just over 3/4 inch. I thought this might be a new piece at first but the back side of pin head has lost some of the carved detailing and a rope trim circle is missing around one of the purple stones. It is a beautiful pin that looks great with scarves!