Every certified diamond from the Gemological Institute of America (GIA) carries a unique identification number. This microscopic laser inscription, typically placed on the diamond’s girdle, serves as a fingerprint linking the stone to its official grading report.
To locate it:
- Use a jeweler’s loupe (10x magnification minimum)
- Examine the diamond’s outer edge (girdle) under bright light
- The alphanumeric code appears as tiny etched characters
The GIA report number allows verification of the diamond’s 4Cs (cut, color, clarity, carat) and authenticity through GIA’s online database. Uninscribed diamonds may still be GIA-certified (older reports), but the number provides instant verification.
Pro tip: Many jewelers offer free verification services if you lack proper tools. Always cross-check the physical diamond with its certificate details.
