There is some basic information that should be considered when selling gold. It is important to have some knowledge about the purity of gold and how this affects your gold. 24 Karat gold is the purest gold you can get in gold bullion, coins, bars or gold jewelry. Coins should originate from a Mint. Smaller items such as rings and other gold jewelry should have an assay mark, or hallmark to show the purity of the gold. The more pure your gold is the higher value it has.