3e SRD:Appraise Skill
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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.
Not on the same object, regardless of success.
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%).