if they do end up keeping it, there are artists metalworker, that will agree to turn things like that into custom arto,if requested. There one in the netherland , I think it is, that offers the service.(they also accept and work with meral that was removed when yiu were still alive, through surgery for example). There seem to be some beautiful examples.

… So, that might be of intrest of intrsst, when writing a will, and to whomever you end up passing that metal to, as a n option, and anlther resin to hold onto those metallic artefacts and keepsakes.