Check: The character can appraise common or well-known objects within 10% of their value (DC 12). Failure means the character estimates the value at 50% to 150% of actual value. The DM secretly rolls 2d6+3, multiplies by 10%, multiplies the actual value by that percentage, and tells the character that value for the item. (For a common or well-known item, the character's chance of estimating the value within 10% is fairly high even if the character fails the check—in such a case, the character made a lucky guess.)
Rare or exotic items require a successful check against DC 15, 20, or higher. If successful, the character estimates the value at 70% to 130% of its actual value. The DM secretly rolls 2d4+5, multiplies by 10%, multiplies the actual value by that percentage, and tells the character that value for the item. Failure means the character cannot estimate the item's value.
A magnifying glass gives a +2 circumstance bonus to Appraise checks involving any item that is small or highly detailed, such as a gem. A merchant's scale gives a +2 circumstance bonus to Appraise checks involving any items that are valued by weight, including anything made of precious metals. These bonuses stack.
Appraising an item takes 1 minute.
Retry: Not on the same object, regardless of success.
Special: If the character is making the check untrained, for common items, failure means no estimate, and for rare items, success means an estimate of 50% to 150% (2d6+3 times 10%).