There’s always a pattern. Societies in decadence abandon gold and resort to baser currency, first silver, then copper and eventually iron or nickel.
Societies in their Zenith use the gold standard…
The gold specie standard arose from the widespread acceptance of gold as currency.Various commodities have been used as money; typically, the one that loses the least value over time becomes the accepted form. Chemically, gold is of all major metals the one most resistant to corrosion.
The use of gold as money began thousands of years ago in Asia Minor.
During the early and high Middle Ages, the Byzantine gold solidus, commonly known as the bezant, was used widely throughout Europe and the Mediterranean. However, as the Byzantine Empire’s economic influence declined, so too did the use of the bezant. In its place, European territories chose silver as their currency over gold, leading to the development of silver standards.