Conjure Mana Gemstone

You create an enchanted gemstone of pure mana, which you infuse with a portion of your power. Choose a spell of 5th level or lower that you can cast, and that has a casting time of 1 action. You cast that spell – called the stored spell – as a part of casting this spell, expending spell slots for both, but the stored spell doesn't come into effect. Instead, the spell is stored in the gemstone used as the material component of this spell. The enchanted stone lasts until you next finish a long rest, or until you cast this spell again.

You can activate the stone by crushing it in your hand with a bonus action, unleashing the spell within it with no additional components. Only you can activate the stone, after which it is destroyed.

At Higher Levels. When you cast this spell at 7th level or higher, the maximum spell level you can store within the conjured gemstone increases by one level for each spell level above 6th.