These talismans are hematite gemstones engraved with the dwarven rune X.  The dwarven archmage, Xagyg the Potent, offers these to those who have earned trust through service or deed.  They give off a bluish glint and faintly radiate magic if detected for of the transmutation school.  Rightful possession of this stone demonstrates trustworthiness to Xagyg the Potent and his followers.  The stone will give off a greenish hue if taken from its rightful owner, warning Xagyg and his followers of dishonesty.