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If the holder uses a damage-dealing Ground-type move, then the holder consumes this item and the power of that move is increased by 50%. One-time use.
In single battles, Ground Gem is not typically a useful item, unfortunately. While the one-time boost to Ground-type attacks is nice, most Pokemon using Ground-type attacks would rather have the more reliable power of Life Orb or Choice items.
Typically Gems are more valuable in the VGC and similar environments, and Ground Gem is sometimes used here to boost the power of Ground-type attacks such as Earthquake from Pokemon such as Rhyperior, which is useful as Earthquake can hit more than one opponent. The one-time power boost can come in very useful in such a fast-paced metagame, especially as it comes without any drawbacks.
Occur randomly in Dust Clouds.