Some, like Viktor Krum suspected him of being a Dark wizard, but actually the necklace simply bears the symbol of the Deathly Hallows to show that he believed in them and was used as a symbol to recognise other seekers of the Deathly Hallows.
The sign was actually composed of three separate marks that, united, make up the sign. The Elder Wand was represented by the straight vertical line, the Resurrection Stone by the circle surrounding it, and finally a triangle enclosing them both to represent the Cloak of Invisibility.
The Butterbeer cork necklace was a necklace that had a Butterbeer cork on it. It was believed to keep Nargles away. A Butterbeer cork necklace was worn by Luna Lovegood, first mentioned on 1 September 1995 when Luna said she believed that Harry was telling the truth about the return of Lord Voldemort.
Why did Grindelwald have the Deathly Hallows necklace?
Object information
It bore the sign of the Deathly Hallows, and was enchanted in such a way that would allow Grindelwald to track the movements of the wearer, and Apparate instantly to their location should they have need of him.
Later in the year, Luna was kidnapped by Death Eaters. To save her, Xenophilius betrayed Harry Potter to Death Eaters. Harry, accompanied by Hermione Granger and Ron Weasley managed to escape. Lovegood was temporarily imprisoned in Azkaban by the Death Eaters.
The Weasleys are known for not supporting the notion of blood purity. They were considered one the biggest "blood traitor" families within the wizarding world of Great Britain. They willingly associated with Muggles, Muggle-borns, and other "blood traitors".
His dad gave it to him. To elaborate on Icecreamdif's answer, he inherited it as a family heirloom dating back to Hardwin Potter, who married Iolanthe Peverell, granddaughter of the Cloak's original owner Ignotus. It was passed down to the eldest male of each new generation of Potters since then.
The blood pact prevented Dumbledore from confronting Grindelwald personally for years, which guaranteed him an advantage in the revolution he was leading. It was eventually retrieved and given to Dumbledore by Newton Scamander in 1927, so that he could find a way to destroy it.
Grindelwald and Voldemort had similar goals but likely wouldn't have been allies due to their desire for ultimate power. Voldemort's search for the Elder Wand led him to Grindelwald, ultimately resulting in the death of the former Dark Wizard.
Luna Lovegood is a Pureblood witch, who was sorted into Gryffindor House during Harry Potter's second year at Hogwarts School of Witchcraft & Wizardry.
She was originally a completely different character
J.K. Rowling later confirmed this character was supposed to be called Lily Moon, an earlier iteration of Luna. Lily's forename was never confirmed in Harry Potter and the Philosopher's Stone as the name 'Lily' was, of course, used for Harry's mother.
Her father, Xenophilius Lovegood, first appears in Harry Potter and the Deathly Hallows, though Luna earlier identifies him as the editor-in-chief of The Quibbler, a magazine that, according to Luna, publishes "important stories he thinks the public needs to know".
Snape having the same Patronus, the doe, as Lily symbolized his everlasting love and unwavering devotion towards her. He hadn't stopped loving her after their last altercation, marriage to James Potter, or death. She was his "always," his guiding light, and he protected Harry for her.
Harry Potter became the owner of the Elder Wand after a skirmish with Draco led Harry to rip Draco's wand from his hand. Even though this was not the Elder Wand, the disarmament of Draco in any fashion still meant that the Elder Wand's ownership had now secretly passed to Harry.
It was a successful theft by Gellert Grindelwald to steal the Elder Wand from the wandmaker Mykew Gregorovitch. Before escaping, Grindelwald stunned Gregorovitch, thereby defeating the last owner and winning its allegiance to pass on to him.
The Tales of Beedle the Bard first appeared as a fictional book in J. K. Rowling's Harry Potter and the Deathly Hallows (2007), the seventh and final novel of the Harry Potter series. The book is bequeathed to Hermione Granger by Albus Dumbledore, former headmaster of Hogwarts School of Witchcraft and Wizardry.
In 1926, Newt Scamander and Tina Goldstein were sentenced to be executed in this fashion by Gellert Grindelwald (disguised as Percival Graves) for violating the International Statute of Wizarding Secrecy.
One of Leta's experiments involving a Jarvey accidentally endangers human life. Newt takes the blame for Leta's actions and is expelled from Hogwarts instead of her. Therefore, Newt turns bitter towards Leta but still remains much in love with her.
Snape definitely knew because in book 4 when Harry sees crouch in Snapes office, he's in his invisibility cloak. As soon as snape sees the golden egg and the map he says 'potters here' to mad eye. Potters here. This is his egg and he's in his invisibility cloak.
As Ilovecats13 and DelphianDragon said, James' father Fleamont quadrupled the family's gold by inventing Sleekeazy's Hair Potion (the same that Hermione used before the Yule Ball to tame her mane). The family fortune was passed down to James, their only child, and then onto Harry. Rowling wrote about it on Pottermore.
The Weasleys are considered one of the prominent wizarding families, although their lack of money and their sympathy for non-pure-blood wizards and even Muggles makes others look down on them.
Multiple characters are portrayed in the series as living in poverty, from the Weasley family to Remus Lupin. But this poverty is created due to a limitation of magic creating a scarcity of resources such as food and other goods.
If you have only seen the films, you might be surprised to hear that it wasn't Cho Chang who betrayed Dumbledore's Army to Professor Umbridge – it was Marietta Edgecombe. A friend of Cho's and a fellow Ravenclaw, Marietta (reluctantly) joined the DA.
