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In most cases, gold used to make coins is of high purity. In the past, gold coins were minted and used as currency. However, during the past few decades, bullion coins made of gold have been the most common type of gold coin created.No precious metal in the world is more popular than gold. Since ancient times, the fabled "yellow metal" has been the standard for measuring assets. During the Middle Ages and beyond, when civilizations started forming from the Dark Ages and engaged in international trade, gold was the common currency among various countries and linguists.