We encourage folks to focus on the lower premium items so virtually all their investment goes into acquiring the metal itself.
Most importantly, that means avoiding so-called “rare,” graded, or proof coins which generally carry high premiums, unrecoverable upon a later sale.
You will almost certainly be better off if you stick with bullion coins, bars, and rounds where the cost is mostly determined by the spot price. Within that group, bars and rounds are almost always the better value.