Gemological Certificate
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Definition
An official document issued by an independent gemological laboratory that records the graded characteristics of a gemstone, including measurements, weight, color, clarity, cut, and any detected treatments.
Detailed Explanation
Certificates (also called lab reports or grading reports) provide buyers with objective, expert evaluation of a gemstone's quality and identity. The GIA Diamond Grading Report is the most widely referenced standard for diamonds globally. For colored stones, reports from GIA, Gübelin, SSEF, and AGL are most respected. A certificate should not be confused with an appraisal (which assigns monetary value). Certificates for treated stones disclose the nature and extent of treatment. The presence of a reputable lab report typically adds confidence and liquidity to a gem's resale value, particularly for stones above 1 carat.