A "Gold Block" is a solid piece of gold that is typically rectangular in shape. It is often used in the finance and investment sectors as a standard measure of gold's value. Gold blocks can vary in size and weight, with the most common being the London Good Delivery bar, which weighs approximately 400 troy ounces. Gold blocks are important for central banks, investors, and jewelers, as they serve as a reliable form of wealth storage. The purity of these blocks is usually measured in karats, with 24 karats representing pure gold. They are also traded on various commodities markets around the world.