Laboratory record
Gemological Institute of America
The trade uses GIA for diamond grading against its own 4Cs scale and for coloured stone and pearl identification reports.
The record
HeadquartersCarlsbad, United States
Founded1931
Kind of bodyReport issuer
Country-of-origin opinionsIssued
StatusIssuing reports
What it covers
DiamondColoured stonePearlJadeOrigin determinationTreatment detectionSynthetic detectionEducation
Reports it publishes
Named as the laboratory names them on its own site. Report contents and wording are set by the laboratory, not by us.
- Diamond Grading Report
- Diamond Origin Report
- Diamond Dossier
- Diamond eReport
- Diamond Focus Report
- Colored Stone Identification Report
- Colored Stone Identification & Origin Report
- Pearl Identification Report
- Pearl Identification & Classification Report
- Cultured Pearl Classification Report
Worth knowing
GIA is a nonprofit institute that also runs gemmological education and research. Geographic origin is issued only under the Colored Stone Identification and Origin Report, which the site limits to alexandrite, demantoid, emerald, jade, opal, Paraiba tourmaline, peridot, red spinel, ruby and sapphire.
Compiled from gia.edu, read on August 16, 2026.
We verify dealers, not stones. A laboratory report describes one stone on one date; it is not a guarantee of value, and it is not ours to stand behind.