Wikipédia
:While most gold medals are solid gold, notable exceptions are gold-plated and often silver-gilt, like those of the Olympic Games, the Lorentz Medal, the United States Congressional Gold Medal (displayed to the right) and the Nobel Prize medal. Nobel Prize medals consist of 18 carat green gold plated with 24 carat gold. Before 1980 they were struck in 23 carat gold.

Y'a pas de petites économies

---

Pourquoi dit-on "Mohammed" mais "Mahomet" ?
Même question pour "cacao" en français vs "cocoa" en anglais.