An important way to examine the relationship between assets is by looking at correlations. Effectively, how do two investments move in relation to each other. For example, the correlation between the entire stock market and just the midcap segment over the past 10 years or so is roughly 0.98. That means they move in virtual lockstep, as you might logically expect. Gold, however, has a correlation with the stock market of 0.04 over that same span. Essentially, gold does its own thing.
The second category is dated bullion gold coins minted by sovereign countries. These are guaranteed as to weight and purity by official mints worldwide and have the added advantage of being legal tender. Each sovereign mint produces various size coins – 1 oz being the most popular. They also mint fractional gold bullion coins in 1/2 oz, 1/4 oz and 1/10 oz each year. The fractional sizes are popular with those who believe gold barter coins may be necessary at some future date.