Lavender Ioun Stone

Lavender Ioun Stone gives the wearer a bonus to armor class of -1 The stone weighs 2 lbs. This item appears in Baldur's Gate II: Throne of Bhaal and Baldur's Gate II: Enhanced Edition. It's not known where this item can be obtained.

In-game description
"The bright lavender hue of this stone dances and sparkles, as if the stone itself were alive."