Which casket is the picture in?

There was a beautiful princess who the king wanted to marry off, but he wanted her suitor to be clever so he put a picture of the princess in one of three caskets. All three held clues. The first, the Gold casket’s clue said “The picture is here.”
The second, the Silver casket said, “It is not here.”
The third, the Lead casket said, “It is not in the Gold casket.”
The King told the suitors that only one clue was true.

So where is the damn picture???