Precious metal "precious" metal can also be determined by high demand or market value. Precious metals in bulk form are known as bullion and are traded on commodity markets. Bullion metals may be cast into ingots or minted into coins. The defining attribute of bullion is that it is valued by its mass and purity rather than by a face value as money. The level of purity varies from issue to issue. "Three nines" (99.9%) purity is common. The purest mass-produced bullion coins are in the Canadian Gold Maple Leaf series, which go up to 99.999% purity. A 100% pure bullion is
Commodity index fund Commodity index fund A commodity index fund is a fund whose assets are invested in financial instruments based on or linked to a commodity price index. In just about every case the index is in fact a commodity futures index. You cannot invest in an index, but you can invest in a fund. A Commodity Index Fund is a fund which either buys and sells futures to replicate the performance of the index, or sometimes enters into swaps with investment banks who themselves then trade the futures. The biggest and best known such fund is the Pimco Real Return Strategy