This is an old brooch that I bought from an old friend. Several years ago I bought around 20 brooches that were in her family. They had from come from San Francisco from an uncle that she had gotten an estate. But she had kept several. Now they are moving out of town and I bought the remaining brooches. These had never been used. But they were all Spectacular and so interesting. This brooch is 2 1/2 by 1 3/4 inch and has a purple glass square in the center. It is shaped and is so interesting. It has a simple C clasp closure. I think that it is brass. For you from Kansas!!