The spot price represents the wholesale cost of raw precious metal in large-format bars (400 oz gold, 1,000 oz silver) traded between banks and refiners on COMEX and the LBMA. No retail customer buys metal in that form. By the time that raw metal is refined, minted into coins or bars, assayed, packaged, distributed, insured and sold through a dealer, costs have been added at every step. The total of those costs above spot is the premium.
A simple formula: Retail Price = Spot Price + Premium. If gold spot is $3,050 and you buy a 1 oz American Gold Eagle for $3,119, your premium is $69 per ounce, or approximately 2.26% above spot. That $69 covers the US Mint's production cost, the dealer's acquisition cost, and the dealer's operating margin.
The premium, not the sticker price, is what you should compare when shopping across dealers. Two dealers selling the same American Gold Eagle at $3,119 and $3,139 look close in price, but the second dealer is charging $20 more per ounce in premium. On a 10-coin order, that is $200. On a career of gold buying, it can add up to thousands of dollars of unnecessary cost.