|"Are you a wizard or not?"
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A powerful curse was placed upon Marvolo Gaunt's Ring, around the time that Lord Voldemort turned it into a Horcrux, as a defence against anyone who might try to destroy it. This curse was designed to quickly kill anyone who dared to wear the ring.
- "The ring, Harry. Marvolo's ring. And a terrible curse there was upon it too. Had it not been — forgive me the lack of seemly modesty — for my own prodigious skill, and for Professor Snape's timely action when I returned to Hogwarts, desperately injured, I might not have lived to tell the tale. However, a withered hand does not seem an unreasonable exchange for a seventh of Voldemort's soul. The ring is no longer a Horcrux."
- —Albus Dumbledore explaining the effects of the curse[src]
This curse would rapidly cause the death of anyone who came into contact with it, although in certain cases the spread of the curse could be slowed down by magical means. In the case of Dumbledore, this curse caused serious injury to his hand, causing it to look as if it had died, and would prove fatal in roughly one year. It was also the type of curse that would strengthen over time. Regardless of the methods of delaying the spread, there is no known way of removing or completely stopping this curse.
Although removing the curse from an infected individual is seemingly impossible, it can be removed from the host object if said artefact is damaged to a certain degree. When Dumbledore used the basilisk venom-infused Sword of Gryffindor to attack the cursed ring, it destroyed the Horcrux and disabled the curse on it. Harry Potter was able to hold the Stone without any sign of the curse affecting him thereafter.
Placing the Curse
After he had acquired his maternal grandfather's prized heirloom ring from his deranged uncle, Tom Riddle wore it openly during his time at Hogwarts after killing his father and grandparents. Once he learned about the effects and possibility of creating multiple Horcruxes, Riddle no longer desired to wear the ring, and instead turned it into a Horcrux with his father's murder. He then placed the curse on the ring as one of the many precautions before he hid it in its place of origin. The lack of hesitancy of placing the curse onto the Resurrection Stone is a sign for Voldemort's lack of knowledge or care for its powers and status as one of the three Deathly Hallows.
- Snape: "Why, why did you put on that ring? It carries a curse, surely you realised that. Why even touch it?"
- Dumbledore: "I... was a fool. Sorely tempted..."
- — Dumbledore explaining why he would adorn the obviously cursed ring[src]
In the Summer of 1996, when Dumbledore found the ring under the rotting floorboards of the Gaunt shack, he saw it immediately as the Hallow that he had desired for so many years, the Resurrection Stone. Wanting to use it to revive his family and apologise for his selfishness in the past, Dumbledore lost his common sense, forget that it was a Horcrux which may have been cursed, and adorned it on his right hand. Almost immediately, the curse triggered, and nearly killed Dumbledore.
However, Dumbledore managed to use his own prodigious skill to contain the curse from spreading any further, which prevented him from dying immediately. He returned to Hogwarts School of Witchcraft and Wizardry quickly and went to see Snape, whose masterful knowledge in the Dark Arts helped him to halt the curse's spread temporarily through a thick golden potion and several incantations.
Unfortunately, Snape claimed that though the curse was contained in his right hand, it would eventually break free of the restraints and spread once again, eventually killing him; he was also angry that Dumbledore fell to the temptation of mounting the ring on his finger, as a wizard of his calibre would have surely detected the curse placed upon it. Snape also claimed that had Dumbledore managed to return sooner, he might have done more to save him. Upon learning that he had no more than a year to live, and in an attempt at preventing a humiliating and agonising death, he requested Snape to Kill him when the time came.
When Dumbledore used the Sword of Gryffindor to crack the ring, the curse seemingly disappeared, as he was able to wear the ring to pick up Harry Potter from the Dursleys with no further ill effects (However, the existing curse on Dumbledore never dissipated, and merely protected people who might touch the ring in the future). Also, when Harry received the Resurrection Stone that was taken out of the ring, the curse did not spread on contact.
Behind the scenes
- The effects of the curse on Marvolo Gaunt's Ring is similar, if not identical, to the effects of severe necrosis (premature death of cells) and rhabdomyolysis (death of muscle tissue throughout the body) after a venomous snake bite, usually from the Bothrops asper. The bitten limb also eventually turns black, "withered", and "rotted", unless the victim treated with antivenom shortly afterwards. This may not be pure coincidence, as Voldemort, due to his fondness of snakes, might have deliberately designed the curse to replicate the Bothrops asper's venom's effect.
- In LEGO Harry Potter: Years 5-7, this curse was shown to have a further effect: Dumbledore's hand appeared to be sentient to some extent. It was shown attacking him at some points, such as before his and Harry's trip to the Horcrux cave, and it became detached upon his death and jumped off of the Astronomy Tower of its own accord.
- Harry Potter and the Half-Blood Prince (First appearance)
- Harry Potter and the Half-Blood Prince (film)
- Harry Potter and the Half-Blood Prince (video game)
- Harry Potter and the Deathly Hallows (Appears in flashback(s))
- Harry Potter and the Deathly Hallows: Part 1 (Appears in vision(s))
- Harry Potter and the Deathly Hallows: Part 2 (Appears in flashback(s))
- LEGO Harry Potter: Years 5-7
- Harry Potter: The Character Vault