gold content
純金 / gold-content — Measuring
Weight × fineness, said of a gold coin.
Croeseidc. BC 550
Fiorino d'oro (florin)13th–14th century
Agnel d'or (the gold lamb)1311
The calculation is the same for gold coins. However, since gold is softer and more valuable than silver, weight loss from wear translates directly into a financial loss.