The value of vintage Trifari jewelry is determined by a jewelry appraiser. However, a person can tell if she has a genuine piece of Trifari jewelry by the hallmark found somewhere on the piece. Pieces of Trifari jewelry have a crowned T, T.F.K, Jewels by Trifari or Trifari in all caps as hallmarks. The hallmark on a piece of Trifari jewelry depends on when it was made.
Appraisers are not licensed, and one way for a jewelry owner to protect herself is to get references for an appraiser the same way she'd obtain references for a building contractor to work on her home. As with a contractor, appraisers who are members in good standing of professional organizations such as the Appraisers Association of America, Inc. should be reliable. The jewelry owner should also interview two or three potential appraisers before she hires one. Estate attorneys are also people to consult when looking for an appraiser, but internet appraisals are also best avoided.
The jewelry owner should also refuse to either sell the piece to the appraiser or to agree to give him or her a percentage of the value of the piece. In spite of this, appraisers are expensive and can charge from $100 to $300 an hour, as of 2015.