From Consumer Wiki
Appraisers of household goods, jewelry, furniture, or cars, etc. are required to have a business license. Complaints may be directed to the Better Business Bureau or handled as a civil issue.
American Society of Appraisers
11107 Sunset Hills Road, Suite 310
Reston, VA 20190
(703) 742-8471 Fax
Publications available: The Small Claims Court, a Guide to Its Practical Use