Gem Bag

Gem Bags can be used to store a total amount of 20 gems. As gems can be stacked up to 20, it only makes space availabe if at least two different kind are stored into this. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate: Enhanced Edition.

In Baldur's Gate II, it's sold at quite some stores, including the Adventurer's Mart.

In Baldur's Gate: EE, it's not known where it can be gained.

In-game description
"This small bag is ideally suited for holding gems."