Seven gold refers to a group of precious metals including gold, silver, platinum, palladium, rhodium, iridium and ruthenium. These seven metals play an important role in industry and investment. As one of the most common precious metals, gold is widely used in jewelry making, investment and financial markets. Silver is widely used in industry and is also an investment. Platinum, palladium gold, rhodium gold, iridium gold and ruthenium gold are mainly used in industrial fields, such as catalysts, electronic components and jewelry materials.