Gold is measured in TONS.
carats, which gives the percentage of gold in an alloy. Also troy ounces which is weight.
"The price of gold stocks will always be changing because the market for gold is always changing. It will depend on the supply and demand for gold, as well as the overall status of the economy."
In most jewelery stores, gold is measured in ounces, but bigger pieces can be measured using grams. Always the metric system though.
It was then worth $16 because of inflation.