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.
Recently certified
A closer look at GSG slabs.
Select any slab to see its certification record and grading detail.
Directional inspection
More light angles. More complete evidence.
Measured centering guides and low-angle rake lighting reveal physical details that a single overhead image can flatten or hide. These real examples show why the extra views matter.
Distributed recesses
Cert 00001137
Luka Doncic
Repeated edge recesses become much more distinct when light travels across the cut.
Triangular corner fold
Cert 00001072
Magic Johnson
The outline looks nearly intact overhead, while rake light traces the folded point.
Explore centering measurements and additional edge, corner, and surface comparisons.
See how GSG inspects cardsWhy 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.
Real GSG output
Patrick Mahomes II 2022 Panini Donruss #24
9.5
MINT
Centering9.5
Corners10
Edges8
Surface10
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.