Then Harry’s mind clicked on another implication, and he looked down at the steel ring on his left hand’s pinky finger, and almost swore out loud when he saw that the tiny diamond was missing and there was a marshmallow lying on the ground near where he’d fallen.
He’d sustained that Transfiguration for seventeen days, and would now need to start over.
Could’ve been worse. He could’ve done this fourteen days later, after Professor McGonagall had approved him to Transfigure his father’s rock. That was one very good lesson to learn the easy way.
It’s been a lot more than a month since then, but that’s the last we hear of it as far as I can tell.
And ever since, I’ve looked forward to the moment when Harry, lacking access to a wand, realizes that he has the means to launch a heavy object at a very high speed by simply ceasing the Transfiguration at the right moment while swinging his fist.
Earlier, Harry had unTransfigured his father’s rock from where it usually rested on his pinky ring in the form of a tiny diamond, and placed the huge gray stone back into his pouch. Just in case Harry’s magic failed entirely, when he confronted the darkest of all creatures.
I think it’s still in his pouch.
(Edit: Whoops, this is wrong.) Chapter 30:
It’s been a lot more than a month since then, but that’s the last we hear of it as far as I can tell.
And ever since, I’ve looked forward to the moment when Harry, lacking access to a wand, realizes that he has the means to launch a heavy object at a very high speed by simply ceasing the Transfiguration at the right moment while swinging his fist.
How about while flicking his finger?
Chapter 43, before confronting the Dementor:
Aha! Well there you go, then.