Harry got to his feet. As he walked across the room, his eyes fell upon the little table on which Marvolo Gaunt’s ring had rested last time, but the ring was no longer there.
“Yes, Harry?” said Dumbledore, for Harry had come to a halt.
“The ring’s gone,” said Harry, looking around. “But I thought you might have the mouth organ or something.”
Dumbledore beamed at him, peering over the top of his half-moon spectacles.
“Very astute, Harry, but the mouth organ was only ever a mouth organ.”
And on that enigmatic note he waved to Harry, who understood himself to be dismissed.

Harry Potter and the Half-Blood Prince – J.K. Rowling