Beljuril

Beljuril is very rare gem, it's one of the component to create Iron Horn of Valhalla.

Baldur's Gate II: Shadows of Amn

 * It can be bought from a farmer or looted from a chicken in the quest There's a WHAT in their chicken?.in Umar Hills

In-game description
"Normally a deep, pleasant seawater green, beljurils periodically blaze with a glittering, winking, flashing light. However, this particular stone has a slightly different hue; perhaps it is a new strain, rarely if ever seen before. It looks incredibly valuable."

Can be used in

 * Creating Iron Horn of Valhalla