How GIA Grades Diamonds
Learn about GIA's processes to ensure the most accurate and ethical diamond grading results.
How GIA Identifies Colored Stones
GIA receives a varied and complex range of items for identification; everything from colored stones and pearls, unusual carvings and jewelry, to the latest in synthetics, and simulants, as well as treated gems.
Investigation into Invalidated Reports Continues: GIA Offers No-Cost Confirmation Service
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Kathryn Kimmel
The first woman on the executive team and head of GIA’s innovative marketing and public relations efforts for nearly 30 years.
GIA Laboratory Client Agreement
To submit any item to GIA for analysis and grading services, you will need to submit a completed Client Agreement with your first shipment.
Disclosing Treated or Laboratory-Grown Gem Material to GIA
When submitting items to GIA for analysis and grading services, you are required to disclose any treated or laboratory-grown gem material.