This is an antique mourning brooch. It has a black stone in the center which I believe is black glass but might be onyx. The setting is not marked but appears to be brass which may have had a gold wash at one time. The brooch has a C clasp and measures 1 inch in diameter. It is in good condition but may cleaning or polishing. Please let me know if you have any questions or would like to make a reasonable offer. Thanks for stopping by.