At least some content in this article is derived from information featured in Harry Potter: Hogwarts Mystery. Spoilers will be present within the article.
Urgruff the Unwary was able to create a perfect replica of a dragon egg in solid gold, sometime before 1990. However after crafting it, a mother dragon mistook the gold egg for one her own, torched his workshop, retrieved the egg from the ashes of the smithy, and took off with it.
At some point during the 1989–1990 school year at Hogwarts, Gringotts Wizarding Bank received intelligence suggesting this dragon had been captured and confined to a famous Dragon Sanctuary in Romania. The bank tasked one of their Curse-Breakers, Bill Weasley, with retrieving it, having even obtained a portkey to send him on his way. The egg was successfully retrieved, and sent to Gringotts for safekeeping.
- Harry Potter: Hogwarts Mystery (First appearance)