One of the funniest things about Preppers hording gold and silver is that most preppers couldn't tell the difference between painted lead and real gold. Or aluminum coated iron and real silver.
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Surprisingly, the topic at hand is taught somewhere between 7th and 11th grade. Measuring the volume and thus density of small odd shaped things is critical to knowing the true makeup of the material under investigation.
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By the way, the density of gold is 19.31 grams per cubic centimeter, and silver is 10.501. I hope those numbers mean something to you. Your survival just might depend on it.
-PP®