Spirit sapphire

Spirit sapphire is one of the three Spirit gems that can store uncharged summoning pouches. The spirit sapphire is able to store up to 10 pouches and has a total of 10 charges. One charge is consumed for each pouch that is created through the gem. Once the 10 charges are consumed, the spirit sapphire is destroyed. Summoning pouches created through the spirit gem are noted. Withdrawing uncharged pouches from the gem does not consume charges.

Uncharged pouches stored within the gem cannot be infused at the Obelisk unless there are uncharged pouches within the inventory as well.

Dropping monsters

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Trivia
The message "One of your spirit gems was completely depleted and has been destroyed" is displayed when a spirit gem is destroyed.