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Gold is undoubtedly the most varied precious metal available to investors and collectors. Most cast gold bars come with three important markings—weight, purity, and metal content—and simply the refinery emblem stamped on their surface. Gold is first melted in a sizable vat, where it is then poured into molds that have been prepared to ensure the right weight and purity of the intended final product. The bars are then let to cool naturally in the molds or, to hasten cooling, are submerged in ice water.