The character is a self-styled Queen with an invented symbol of a silver heater-shaped shield with a golden crown in the position of the chief band, and a crossed nail and rivet below that which form an X shape. Although the setting's not Earth, she's the sort of character who would know the proper way to describe it. Argent a corona or above crossed clou et rivet is the best I can do. Is that close to what I want?
Thank you!