Silver box: The jewels are not here.

Lead box: The jewels are not in the box.

Only one of the three sentences is true.

=================================

The jewels are in the silver box.

Because:

As we all know, "a pearl is hidden in one of the boxes",

Therefore, the sentence "lead box: jewelry is not in the box" must be false;

-

Once again:

The words on the gold box and the silver box also have a lie and a truth.

If the pearl is in a gold box, it won't be in a silver box.

Then: "the gold box: the jewels are here" and "the silver box: the jewels are not here" are both true.

Do not agree with the meaning of the question and rule out the situation.

-

Look again,

If the pearl is in a silver box, it won't be in a gold box.

Then: the sentence "golden box: here are the jewels" is false; The sentence "Silver box: the jewels are not here" is true.

Meet the meaning of the question.

Therefore, pearls are in a silver box.