Mendacipathy
Mendipathy, also called lie detection, is a subset of Telepathy which grants bearers the ability to detect when others are being truthful or untruthful.
Most Read or Read/Write Telepaths are also Mendacipaths, but there are other forms of Mendacipathy which do not involved consciously reading the mind of an individual.
Andvari's Gold is curse to reveal the truth of those who possess it, and several items made with or connected to the gold also possesses this power, such as Gram.