Even nowadays any gold coin has no useful value for day to day stuff.
“functionally no one used gold in any amount in every-day transactions in the ancient or medieval Mediterranean (or most other places!), because a gold coin at almost any size was such an enormous monetary unit as to be unsuited to most transactions. “
https://acoup.blog/2025/01/03/collections-coinage-and-the-tyranny-of-fantasy-gold/