I see two and only one reasons to have any precious metal, stone or something with numismatic value as part of a survival strategy.

If you foresee the possiblity of having to pick up and move a long distance, with most of your property and assets left behind, these can be a way to transport the value, by carrying it with you.

Forexample, let's say you have stocked well in preparation for some calamity, survived it, have plenty of goods, more than you can trasnport and you want to move. If what you have has value, then abandoning it may not be the best idea. If you had precious metals or traded things it, then you can transport an asset of value. In other words, I could carry a signifcant value in these things, and that might be a good option to have.

The second would be as a hedge against the complete collapse of the economy. If things really tank, and you make it for a while, then they may have value in trade. But we'd need to be back toward a barter only economy, and that's pretty bleak.

You can also find them to be just a worthwhile thing to invest in, but that's not something I would ever advise anyone on.