Grade and subgrade detail
Each GSG-certified card can show an overall grade plus subgrades for centering, corners, edges, and surface.
AI-graded trading cards
Consistent grading. Verified cards. Listing-friendly images.
Granite State Grading uses software-assisted analysis to create consistent, repeatable grades for the cards we slab. Each certified card includes a public verification page, clear subgrade detail, and clean marketplace-ready images.
Public cert verification
Every GSG slab has a certification number that links to a public record showing the card identity, grade, subgrades, and slab images.
Marketplace-ready images
GSG-certified cards can include clean front and back slab images designed to help buyers see exactly what they are purchasing.
Why GSG-certified cards?
A clearer way to buy slabbed cards.
A graded card should be easy to understand and easy to verify. Our labels show the overall grade, subgrade detail, and a QR-backed certification page so buyers can confirm the record behind the slab.
Consistent
No fatigue, no drift — the same grading criteria applied to every card.
Detailed
Subgrades help explain how the card was evaluated.
Verifiable
Each cert page connects the slab label to the card record and slab images.
✓ Verified
Cert #00001234
1990 Topps Rick Burleson #123
9.5
GEM MINT
Centering9.5
Corners9
Edges9.5
Surface9
Designed for collectors and buyers.
GSG-certified cards are built to be easy to inspect, easy to verify, and easy to present online. Whether a card stays in a collection or gets listed for resale, the certification record travels with it.