What do you mean, you need professional appraisal, but you can't?
Have no right to estimate. Jewelry appraisal strictly belongs to the scope of work of jewelry appraisers or jewelry appraisal institutions, and non-professional appraisal institutions have no right to conduct appraisal. The work scope of jewelry appraisers and jewelry inspection institutions is to identify the types and properties of minerals, as well as the synthesis, optimization and treatment of samples.