Card Grading Glossary

Every term you'll hear in the card-grading hobby, defined in plain English.

10 (Gem Mint): The highest conventional grade assigned by PSA, SGC, and CGC. A PSA 10 or SGC 10 Gem Mint card has essentially no visible flaws to the naked eye.
10 Pristine (BGS): Beckett's highest assignable grade, above BGS 9.5 Gem Mint. Requires sub-grades of 9.5 or higher across centering, corners, edges, and surface.
Autograph Authentication: Expert or algorithmic verification that a signature on a card is genuine. Increasingly performed by AI against exemplar signature libraries.
Authentic: A designation given to a card that is verified real but damaged enough that it cannot receive a numeric grade (e.g., trimmed, recolored, or altered).
BGS: Beckett Grading Services. Known for printing four sub-grades (centering, corners, edges, surface) on every slab label.
Break-Even: The card value at which grading fees + shipping are recouped by the graded sale price. Below break-even, you lose money grading.
Centering: The ratio of border widths on a card, measured front-to-back. A 50/50 split is perfect. PSA typically requires 55/45 front and 75/25 back for a 10.
CGC: Certified Guaranty Company. Widely used for Pokémon and trading-card-game singles; part of the Certified Collectibles Group.
Cert Number: The unique certification number on a graded slab. Used to verify a slab's authenticity against the grading company's public database.
Chrome: A chromium-stock card finish (e.g., Topps Chrome, Bowman Chrome) prone to edge chipping and centering issues.
CSG: Certified Sports Guaranty. Sports-card arm of the Certified Collectibles Group, sister brand to CGC.
Declared Value: The value you declare on a grading submission. Determines which service tier you qualify for and the insured replacement value.
Edges: One of the four sub-scores. Graders check for chipping, whitening, and roughness along every edge of the card.
Error Card: A card with a printing or production error. Some error cards (miscut, missing ink) are more valuable than the regular printing.
Gem Mint: The highest quality tier — a card essentially indistinguishable from factory-fresh condition.
GMA: Global Mint Authentication (sometimes Graded Mint Authentication). A budget grading service popular for protecting personal-collection cards.
HGA: Hybrid Grading Approach. AI-assisted grader known for color-matched display slabs.
Holo: A holographic-foil card. Prone to surface scratching and print-line defects in the foil layer.
ID Grade: ID Grader's composite predicted grade across centering, corners, edges, and surface.
ISA: International Sports Authentication. A mid-tier sports-card grader with half-point grades and clear sub-scoring.
Mint: A grade of 9 — near-perfect condition with only the slightest imperfections detectable under close inspection.
Pop Report: A grading company's public population report — the count of how many copies of a specific card have been graded at each grade level.
Pre-Grade: An estimate of a card's future grade before it is physically submitted. ID Grader's core feature.
PSA: Professional Sports Authenticator. The largest and most influential card-grading company in the world.
Qualifier: A designation attached to a grade (e.g., PSA 9 OC for off-center) noting a specific flaw that capped the grade.
Raw: An ungraded card. The opposite of a slabbed card.
Rookie Card: A player's first officially licensed card. Typically the most-collected and most-graded card of any athlete.
Sub-Grade: An individual score for centering, corners, edges, or surface. BGS prints sub-grades on every slab; ID Grader returns them on every scan.
Surface: One of the four sub-scores. Graders check for scratches, print lines, indentations, and gloss inconsistencies under angled light.
SGC: Sportscard Guaranty. Known for fast turnaround and the iconic black-border slab, popular for vintage.
Slab: The sealed tamper-evident plastic case a graded card lives in. Also used as a verb — "I'm going to slab this card."
TAG: Technical Authentication & Grading. A computer-vision grading company that ships a public report with every slab.
Turnaround: How long a grading tier takes from receipt to shipment. Varies from a few days (express) to many months (value).