It's important to note that "argent" is a masculine noun, but it is used in a feminine context when referring to the color silver. This is because it's describing the color of something, not the metal itself.
For example:
* Une robe argent: A silver dress
* Des chaussures argentées: Silver shoes
* Une montre argent: A silver watch
However, if you're talking about the metal itself, you'll use the masculine form:
* L'argent est un métal précieux: Silver is a precious metal
* Le prix de l'argent est en hausse: The price of silver is rising