At a certain point, these jewels are bestowed upon the children of Disney Heroes and Villains at a ceremony known as the Jewel BiLee.
The jewels belonging to the VKs were confiscated when the villains were relocated. All except Mal's, which was hidden and cursed by her mother until it was found inside a necklace.
The VKs jewels are known to possess powerful magic, enough for one villain to conquer the land of Auradon.
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