While having paperwork or receipts can add some credibility to the authenticity of your gold jewelry they are not always necessary. Reputable gold jewelry buyers can conduct tests and evaluations to determine the golds purity and value. However if you have any documentation such as certificates of authenticity or previous appraisals it can be helpful during the selling process. Its essential to choose a trustworthy buyer and be prepared to provide identification as required by local regulations when selling gold jewelry.