The value of gold bullion coins in its essence is the gold value of a coin plus the premium. The gold value varies with the time of course but it is what it is on the gold market, which is around $30 per gram at the present. The premium on the other hand is a very subtle subject and can be affected by many factors. And we're going to have a look at some of them.
One of the most usual factors is the coin grade. This one can be split into the coin finish and the coin grade itself. The finish for gold bullion coins can be either brilliant uncirculated or proof. Proof coins usually have higher premium than their brilliant uncirculated counterparts. The grade of a coin is basically its condition. And of course, better condition means higher premium. The grade can vary from PO-1 (pure) to MS-70 (perfect) for normal coins and from PF-01 to PF-70 for proof coins.