Skydrop Gem

Skydrop Gems are valuable gems in the game which may be found. This item appears in Baldur's Gate, Baldur's Gate: Enhanced Edition, Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition.

In-game description
"Skydrop is the common name given to clear or lightly colored tektite material; fragments of glass of celestial (meteoric) origin, found in the vast shifting sands of Anauroch and other deserts."