Care for the card.
Grading starts with a close look at the details—and respect for the collection each card belongs to.
Gem State Mint · Boise, Idaho
Started by a collector.
Built around your collection.
There’s a story behind every card. We’re here to help you look after yours—and discover what comes next.
A little more care.
A closer connection to the hobby.
GSM started in Boise with a simple idea: card grading should feel approachable, with clear standards and care for the cards collectors send us.
We know a collection can hold more than its market value. It can be a childhood favorite, a hard-to-find set piece, or the card that brought you back to the hobby.
That collector’s perspective connects our grading service and card store. Whether you’re preserving a favorite or looking for a new one, you’re in the right place.
Get to know our processWhat matters to us
Good cards. Good care.
Clarity in the grade.
Explore our standards, learn what we look for, and look up the record behind a GSM certificate.
Room to collect.
The next card is part of the fun. Find something familiar—or something unexpected—in our card store.
Say hello
A question about your cards?
Talk to us about grading, your collection, or an order. We’ll help you find the right next step.
Browse questions & answersYour collection’s next chapter.
Grade a favorite. Find a new one.