He learned, for example, that gold of 0.995 purity is the more commonly traded variety in India, the world's biggest market for the precious metal.

FORBES: On The Cover/Top Stories

This promise can be verified every minute of the day by observing the current rate of exchange between the dollar and gold, and, under a classical gold standard, by exchanging currency at a national bank for gold coins of a fixed weight and purity.

FORBES: The Dollar, Gold And The Quality Of Money

Actually, gold bullion is any form of pure, or nearly pure, gold that has been certified for its weight and purity.

FORBES: Getting Into The Gold Market