The Earth Gem is a magical crystal that contains great power, which can be used to summon and control the Sapphire Fairycorn if united with the Water Gem and Air Gem by the Vase of the Three Realms.
Barbie: A Touch of Magic[]
The earth gem was protected by the wizard Titan, who later gave it to Leo for protection.
Skipper used it to counteract a wish she made with the Water Gem that accidentally turned her parents into babies.
It was stolen by Dru Charles, who used all 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 all broke to pieces as a result.