Merchant's GuileEquipment 5
Source Pathfinder Adventure: The Fall of Plaguestone
Price 160 gp
Weight negligible
The band of this ring is made from blue-colored iron and has two sharp, decorative protrusions on each side of the red-stone inlay. It feels quite heavy and reliable. Wearing this ring grants you a +2 item bonus to Deception and Diplomacy checks, but only if the associated checks involve haggling or bargaining over a purchase or trade.
Activate 
envision, interact
Effect You can determine if an item is magical simply by handling it. You detect no other indication of its power, only whether or not it is magical, granting the effects of a 1st-level Detect Magic spell that affects only the object.
Traits
Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
EnchantmentEffects and magic items with this trait are associated with the enchantment school of magic, typically involving mind control, emotion alteration, and other mental effects.
InvestedA character can wear only 10 magical items that have the invested trait. None of the magical effects of the item apply if the character hasn't invested it, nor can it be activated, though the character still gains any normal benefits from wearing the physical item (like a hat keeping rain off their head).