Frequently Asked Questions

How does GIA grade D-to-Z diamonds?


Diamond buyers rely on GIA grading reports to validate a diamond’s quality. GIA operates under a set of core principles to safeguard the accuracy, objectivity and integrity of every report issued. We invest heavily in research, staff, and technologies to ensure consistent and accurate analysis, and we rigorously monitor our processes to protect against any breach in conduct or security.

Learn more about how GIA grades diamonds.

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