Sphene Gem

Sphene 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
"Sphene is a soft, brittle gemstone (and, like scapra, easily worked by unskilled cutters) of various yellow to green shades, the most prized of these being a fine emerald green."