Hi Xuan,

In the lesson de l'argent can mean 'some' or 'any'. e.g.

J'ai de l'argent à te donner =I have some money to give you

Vous avez de l'argent en Euros? = Do you have any money in Euros?

In what context have you seen 'd'argent'?

Normally when argent means 'silver' , we will use 'en',

i.e. Elle a un beau collier en argent= She had a pretty silver necklace.

Hope this helps!

Of course as in,

beaucoup d'argent ( a lot of money), pas d'argent (no money)

Not particular to 'argent' ...