Certification · 4 min read
Jewelry Appraisal vs. Diamond Grading Report: What Buyers Need
Understand what an appraisal, grading report and seller's authenticity certificate can tell you — and what each cannot prove.
A grading report describes the stone, not its price
A diamond grading report records characteristics assessed by the issuing laboratory. Depending on the report type, it can include measurements, carat weight, colour, clarity and other observations. A report is not a monetary appraisal, an insurance policy or a promise that a stone will increase in value.
Read the actual report rather than relying on the word 'certified' in a listing. Check which stone was examined and what the report covers. Diamond reports, coloured-stone identification reports and geographic-origin opinions are different products; not every report includes the same findings.
An appraisal assigns a value for a stated purpose
An appraisal should identify the item, the valuation date, the purpose and the basis of value. An insurance replacement appraisal addresses a different question from an estimate of what a dealer or auction buyer might pay. A high insurance figure does not establish a future resale price.
Ask about the appraiser's qualifications and independence, and whether the valuation includes the mounting and all stones. Discuss the document with your insurer: coverage, exclusions, excesses and required updates depend on the policy. A valuation document alone does not put insurance in force.
A seller's certificate is another part of the record
A certificate of authenticity issued by a seller records that seller's statements about the piece. Keep it, but distinguish it from independent laboratory testing. Compare its metal, stone and condition descriptions with the invoice, product listing and any laboratory report; ask the seller to resolve discrepancies in writing.
For high-value purchases, keep all three types of documentation when supplied: the seller's description, relevant laboratory findings and the valuation. Riakoob's stated certificate, insured value and 12-month promise should be read alongside the full guarantee terms and the documentation for the specific piece.
Verify a report without mistaking a match for proof
Use the issuing laboratory's own report-check service when available. GIA Report Check lets you compare a report number with the laboratory's stored information. A matching number verifies the record exists; it does not by itself prove that the stone in front of you is the stone examined.
Ask a qualified professional to compare the physical stone with its report when identification matters. Preserve photographs, receipts and correspondence. If you are buying remotely, request readable document images before paying and avoid treating an unreadable report screenshot as verification.
Further reading & references
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