It was one of Voldemort's Horcruxes, it also has the Resurrection Stone hidden inside it.
Marvolo Gaunt's Ring
it is one of the 7 horcruxes that are needed by harry to finally destroy voldemort
It was destroyed in Dumbledore's office using the sword of Gryffindor.
Albus Dumbledore did.
He is and always has been since he was one years old a Horcrux, do defeat voldemort he has to be dead before voldemort can be officially killed. Horcruxes: Nagini - Snake Helga Hufflepuffs cup Rowena Raeclaws diadem Salazar Slytherins pendant Marvolo Gaunts ring (resurrection stone (one of the deathly hallows)) Tom Riddles Diary Harry Potter
During one of his lessons with Dumbledore.
Harry learnt that Voldemort was related to the Gaunts and that Voldemort probably had their ring. Glad 2 help!
Inside Marvolo Gaunt's ring, one of Voldemort's Horcruxes (although Voldemort was unaware of it).
Marvolo Gaunt was the maternal grandfather of Tom Marvolo Riddle aka Voldemort. He was a direct descendant of Salazar Slytherin which explains why he and his family could speak Parceltongue and he was also a further descendant of Cadmus Peverell who was given the Resurrection Stone by Death as indicated by Marvolo's ring which Voldemort used as a horcrux.
The Wedding at Cana?
Slytherins Locket, Marvolo's Ring, Ravenclaw's diadem, Hufflepuff's cup, Nagini, Tom's Diary, and Harry himself
The ring first made an appearance in Harry Potter and the Half-Blood Prince, although it also appears in Harry Potter and the Deathly Hallows (Parts 1 and 2), because it is one of the Deathly Hallows.