He holds out a single earring, familiar to Arcane Sight, but larger and less spellsilver-efficient than her own version; a specialized geas.  "This earring compels you to keep bargains and promises you make with me after putting it on, unless I violate my side of the compact.  It prevents you from lying to me, but doesn't prevent concealing information.  It's cursed against voluntary removal, and the geas prevents you from trying to arrange to have it removed.  Once worn it hides itself and looks like an ordinary earring to regular Detect Magic.  I, for my part, swear to you that that's all this earring does."

He holds out a single earring, familiar to Arcane Sight, but larger and less spellsilver-efficient than her own version; a specialized geas.  "This earring compels you to keep bargains and promises you make with me after putting it on, unless I violate my side of the compact.  It prevents you from lying to me, but doesn't prevent concealing information.  It's cursed against voluntary removal, and the geas prevents you from trying to arrange to have it removed.  Once worn it hides itself and looks like an ordinary earring to regular Detect Magic.  I, for my part, swear to you that that's all this earring does."