Appraising

This proficiency is highly useful for thieves, as it allows characters to estimate the value and authenticity of antiques, art objects, jewelry, cut gemstones, or other crafted items they find (although the DM can exclude those items too exotic or rare to well known). The character must have the item in hand to examine. A successful proficiency check (rolled by the DM) enables the character to estimate the value of the item to the nearest 100 or 1000 gp and to identify fakes. On a failed check, the character cannot estimate a price at all. On a roll of 20. the character wildly misreads the value of the item, always to the detriment of the character.