Rogue Stone

Rogue Stones are very valuable gems in the game which may be uncommonly found. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition.

In-game description
"A small, shifting, rainbow coloured, irridecent gemstone. The fluid shades of colour appear almost liquid under normal sunlight, it is truly a beautiful sight to behold. Rogue stones are extremely rare and are used for the gemjump spell, hence one of the most sought after gems in the Realms."