Not the ring. Ch. 105:

No, I expect you Transfigured Granger's remains into the ring itself, letting the aura of the Transfigured jewel mask the magic in the Transfigured ring."

"Yes," Harry said, forcing out the word. It was a lie, for once, and Harry's glance had been deliberate. Harry had expected someone to challenge him on the steel ring, he'd tried to provoke that challenge so he could prove to be innocent yet again, though nobody had taken him up on it - maybe Dumbledore had just sensed that the steel by itself wasn't magical.

solipsist pointed out in the ch.109 thread that Harry's glasses are a good candidate.