Judith Jack marcasite and sterling brooch with amethyst center. Vintage.

Judith Jack marcasite and sterling brooch with amethyst center. I do not know if the amethyst is a real stone or a crystal. Vintage. In good condition and has been kept in pouch shown in photo 6 for about 20 years. 8th photo is highly magnified to show the engraved details. First and 5th photos were taken in front of a window. Last photo shows the stick of the pin. The front needs to be polished. As I am not a marcasite connoisseur, will leave up to purchaser to polish it up.