This is the 16643rd most frequent Russian word.
серебряных
"Silver" (genitive plural or adjective form).
Here, 'серебряных' is used as an adjective in the genitive plural form to describe the material of the coins, indicating they are made of silver.
У меня есть коллекция серебряных монет.
I have a collection of silver coins.
In this sentence, 'серебряных' works as an adjective in the genitive plural form, describing the medals as made of silver.
Для победителей приготовили серебряных медалей.
Silver medals were prepared for the winners.
Here, 'серебряных' modifies 'ложек,' indicating the material of the spoons is silver, using the adjective in the genitive plural form.