Gold bullion refers to gold that gets its value from its purity and weight, as opposed to jewelries or antiques where other factors such as aesthetics, colour, design, history come into play. Gold bullion is useful for gold investors as well as gold fabricators. Gold bars: Gold bars often take rectangular shapes, although gold bars take multitude of shapes as long as they are refined. Gold bars can be cast or minted. Gold bars that are cast are thicker and are generally called ingots. Gold that is stamped is thinner and flatter, and they are called gold wafers/biscuits. Gold bars come in many different shapes and sizes and can generally be split into 55 categories. Only about 30 types of gold bars are in general circulation around the world with the Good Delivery gold bar being the most popular. Gold bullion coins: It is often mistaken that gold coins are expensive because they are usually antiques or precious collectors items. This form of gold works exactly the same way as the metal bars, except their shape is in the form of coins and are usually much smaller. Many countries produce their gold coins with national emblems embedded onto them. The most popular ones in the market today are Eagles, Maple, Kruggerands, Pandas, Prittannias and Sovereigns. Numismatic gold coins: These types of gold coins generally do not have a fixed weight or purity to it and tend to be old gold coins that are no longer in production. This makes these gold coins have more value than their weight in gold. Unrefined gold: Gold in its original state is naturally unrefined and can take different forms. For example, gold nuggets are naturally occuring pieces of native gold that have quite large sizes and their purity ranging from 20K to 23K. Unrefined gold can also be in the form of gold dust or other types of gold deposits. Gold scrap: Gold scrap refers to any gold item that has more value for the gold inside it, than it's worth as an item.