1 16。 64 grams. The specifications of gold bars are divided by weight, and different brands have different specifications and weight units. The legal unit of mass in China is kilogram, so the commonly used specification unit is gram. The weight of a standard gold bar is 1 16. 64 grams. There is no uniform regulation on the weight of gold bars. When circulating in the gold exchange or market, the standard weight specifications of standard gold bars are 10g, 30g, 50g, 10g, 300g, 500g, 1000g respectively, and the purity of gold is 99%. 99。 The investment varieties in the gold market are mainly divided into physical gold investment and gold investment derivatives derived from physical gold. Derivatives mainly include gold futures and gold options, and physical gold investment mainly includes gold bars, coins and gold ornaments. Gold bars come from ancient currency circulation and are more used in the fields of collection and investment. Major banks and financial institutions around the world reserve and circulate their own signature gold bars, such as the standard gold bars of Shanghai Gold Exchange.