Wow...Those are just way overpowered. An encounter power that allows you to autohit daze(se)... As a daily power with an attack roll vs Will on a creature within a close burst 5, that might be balanced, but definitely not if it's stunned. Also, the lack of a slot is an issue; perhaps count it as a head slot instead. I'd probably make it a daily power, a +14 vs Will attack, for dazed until end of next turn, or save ends if it spoke an untruth.
I thought the lack of a slot might affect the balance. How's this?
Earring of Neltak Level 10
These earrings are tiny golden, upside-down axes; they are holy to the god Neltak, Lord of Law.
Slot: Head 5000 gp
Property: You gain a +2 item bonus to insight checks to discern any untruths spoken in your presence. Power (Daily, Divine, Radiant): Standard Action. You call down Neltak's judgment on a target. Make an
attack: Ranged 5; +14 vs. Will; on a hit, the target is dazed until the end of your next turn. If within the last 5 minutes you discerned the target as having spoken an untruth in your presence, the target is stunned instead of dazed.