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Gold Bullion: Bars, Rounds, Coins. Gold Bullion Bars . A flat bar struck using .999+ (usually) pure gold is known as a gold bullion bar. Ranging from 1 troy ounce to even 32 troy ounces, gold bars are available in various sizes. However, 1 gram, 1 oz, 100 gram and kilo size remain the most common weights available in the bullion market.