Stone of Wit (3.5e Equipment)
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Stone of Wit: This item takes the form of a necklace or choker bearing a glittering sapphire. This stone possesses the power to sense the subconscious desires of those around it and guide the speech of its wearer accordingly. This provides a +4 insight bonus to Bluff, Diplomacy, and Gather Information checks, but only when the wearer is dealing with a single person; you cannot use the powers of the stone to help you when you are giving a speech to a crowd.
Moderate enchantment;CL 6th; Create Wondrous Item, charm person; Market Price: 2,400 gp