The Vase of the Three Realms was a magical item that could harness the magic of all three gems: the Air Gem, the Water Gem, and the Earth Gem. Once all three are placed on the vase, it could be used to summon and control the Sapphire Fairycorn.
Barbie: A Touch of Magic[]
The vase was placed on a display stand at the Malibu history museum before it was stolen by Dru Charles, who used the vase and the gems to control the Sapphire Fairycorn, make herself famous and steal magic from all three realms until Malibu tricked her into destroying the magic. The gems and the vase were all destroyed as a result.