A slabbed or graded card has been authenticated and encased in a tamper-evident plastic case by a third-party grading service, with a numerical grade representing its condition.
A slabbed (or graded) card has been submitted to a third-party grading service for authentication and condition assessment, then sealed in a tamper-evident plastic case with the assigned grade printed on a label inside the slab. The grading process inspects centering, corners, edges, and surface; the resulting numerical grade (typically on a 1-10 scale, sometimes with half-grade subgrades) is the industry-standard condition signal.
The major grading services for trading cards are PSA (Professional Sports Authenticator), BGS (Beckett Grading Services), SGC (Sportscard Guaranty), and CGC (Certified Guaranty Company). Each uses its own grading scale, label design, and turnaround pricing. PSA is dominant in modern American sports cards; BGS leads in vintage and basketball; SGC has historically led in vintage baseball; CGC is the rising graded-comic-book service expanding into cards.…Read more
Grading materially changes a card's market value. A raw (ungraded) card might trade in a wide range based on subjective condition assessment, while the same card graded PSA 10 (Gem Mint) trades at a clear premium because the condition is contractually authenticated. Grading premiums compound with rarity — a high-end rookie card in PSA 10 can be worth multiples of the same card raw or in PSA 9.
Frequently Asked Questions
The card has been sent to a grading service (PSA, BGS, SGC, or CGC), authenticated, condition-graded, and encased in a tamper-evident plastic case. The slab cannot be opened without breaking the seal — which destroys the grade.
PSA 10 (Gem Mint) is the highest standard grade PSA assigns. It indicates the card is essentially flawless: perfect centering, sharp corners, clean edges, and pristine surface. PSA 10 is rare for vintage cards and competitively priced for any high-demand modern release.
Usually, yes — grading converts subjective condition assessment into a contractually authenticated grade, which materially reduces buyer risk. The premium scales with grade and rarity: a PSA 10 of a high-demand rookie can be worth several multiples of the raw version of the same card.
