Elemental GemConsumable 10
Source Pathfinder Core Rulebook
Price 200 gp
Weight negligible
Activate 
Command, Interact
You shout the name of an elemental lord and dash this glassy gem against a hard surface to activate it. It cracks open, casting a 5th-level Summon Elemental spell to summon forth an elemental you control as long as you spend an action each round to Sustain the Activation.
This gem comes in four varieties: transparent for a living whirlwind, light brown for a living landslide, reddish orange for a living wildfire, and blue-green for a living waterfall.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
ConjurationEffects and magic items with this trait are associated with the conjuration school of magic, typically involving summoning, creation, teleportation, or moving things from place to place.
ConsumableAn item with this trait can be used only once. Unless stated otherwise, it's destroyed after activation. Consumable items include alchemical items and magical consumables such as scrolls and talismans. When a character creates consumable items, they can make them in batches of four.
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.