Most of the plates in the market are not made of gold except those that are expensive. Therefore, if these utensils are expensive, you should take them to a goldsmith or a jewelry shop and they can advise you. If they say that there is gold or silver in it, you shouldn’t use them. You can either put them as decoration or you can sell the gold and silver in them and not the plates. This is so that people would not use it to eat in.
And Allah knows best