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Bullion is gold, silver, or other precious metals in the form of bars, ingots, or specialized coins. Typically, bullion is used for trade on a market. The word "bullion" comes from the old French word bouillon, which meant "boiling", and was the term for the activity of a melting house.
The value of bullion is typically determined by the value of its precious metals content, which is defined by its purity and mass. To assess the purity of gold bullion, the centuries-old technique of fire assay is still employed, together with modern spectroscopic instrumentation, to accurately determine its quality to ensure the owner receives fair market value for it. It is also weighed extremely accurately.
The specifications of bullion are often regulated by market bodies or legislation. In the European Union, the minimum purity for gold bullion, which is treated as investment gold with regard to taxation, is 99.5% for gold bullion bars and 90% for bullion coins.
Investors may choose to purchase physical gold bullion for several reasons - to attempt to hedge against currency risks, inflation risks, geopolitical risks, or to add diversification to an investment portfolio.
The London bullion market is an over-the-counter market for wholesale trading of gold and silver. The London Bullion Market Association (LBMA) coordinates activities of its members and other participants in the London bullion market. The LBMA sets and promotes quality standards for gold and silver bullion bars. The minimum acceptable fineness of the Good Delivery Bars is 99.5% for gold bars and 99.9% for silver bars.
Bullion coins are contemporary precious metal coins minted by official agencies for investment purposes. Some bullion coins have been used as currency throughout the 20th century, such as the Maria Theresa thaler and the Krugerrand. However, modern bullion coins generally do not enter common circulation despite having legal tender status and a nominal face value. Some modern bullion coins are produced as both business strike and collectible proof and uncirculated versions, such as the gold and silver American eagle. Business strikes[clarification needed] typically are sold at prices commensurate with their precious metal content, whereas collectible versions are sold at a significant premium over their actual bullion value. In some cases, the grade and mintages of business strike coins can affect their value, so they are considered numismatic rather than bullion items.
A range of professional market participants is active in the bullion markets, such as banks, fabricators, refiners, and vault operators or transport companies, as well as brokers. They provide facilities for the refining, melting, assaying, transporting, trading, and vaulting of gold and silver bullion.
Besides the direct bullion market participants, other professional parties such as investment companies and jewelers use bullion in the context of products or services which they produce or offer to customers. For example, shares of the world's largest gold exchange-traded fund, the SPDR Gold Shares, represents ownership in vaulted gold bullion.
Private individuals use bullion primarily as an investment or potential store of value. Gold bullion and silver bullion are the most important forms of physical precious metals investments. Bullion investments can be considered as insurance against inflation or economic turmoil and may not entail direct counterparty risk.
Compared to numismatic coins, bullion bars or bullion coins can typically be purchased and traded at lower margins and their trading prices are closer to the values of the contained precious metals.