Waterstar Gem

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

In-game description
"Waterstar is also called achroite or colourless tourmaline and is rare in the Realms. This stone is riddled with flaws and inclusions and hence only a small portion is fit for cutting."