Just one point, gold and silver in the hand is useable. Gold and silver stored in an account away from you is not available at need. Assay costs can eat you alive when dealing with them. Sealed, assayed metals from a consistent dealer may alleviate some of those costs. A preferred smelter can give spot cash as to the weight and spot price of gold that day. There are some that cheat at both.
I was jeweler and found out the hard way. And found a good smelter, you will have to do your own research.
~Richard