What is Card Grading?
What is Card Grading?
Card grading is the process of having a trading card professionally evaluated, authenticated, and assigned a numeric grade based on its condition. A graded card is then sealed in a tamper-evident plastic case — called a slab — that protects the card permanently and displays the grade for all to see.
Grading turns a raw card into a certified, standardized asset. Instead of two collectors arguing over whether a card is "near mint" or "lightly played," a graded card has an objective, third-party score that the entire hobby agrees on.
Why Does Grading Matter?
A graded card is worth more than the same card ungraded — sometimes dramatically more.
The reason is simple: buyers trust a professional grade. When you buy a PSA 10 Charizard, you know exactly what you're getting. When you buy a raw Charizard from a stranger on eBay, you're guessing. That certainty has real monetary value.
Grading also protects your card. Once sealed in a slab, the card can't be touched, bent, or damaged. For valuable cards, a slab is the safest place they can be.
How Does Grading Work?
The process is straightforward:
1. Submit your card You send your card to a grading company — either directly or through a submission service like Corridor Cards. The card travels in protective packaging to prevent damage in transit.
2. The card is evaluated Professional graders examine the card under magnification and assess four key areas: centering, corners, edges, and surface. Each is evaluated for defects like print lines, scratches, creases, or wear.
3. A grade is assigned Based on the evaluation, the card receives a numeric grade — typically on a scale of 1 to 10. A 10 is perfection. A 1 is barely identifiable as a card.
4. The card is slabbed The card is sealed in a hard plastic case with a label displaying the grade, the card name, the set, and a certification number you can verify online.
5. The slab is returned Your certified card comes back ready to display, sell, or store.
What Do the Grades Mean?
Most grading companies use a 1–10 scale. Here's what each range means in plain terms:
| Grade | Label | What It Means |
|---|---|---|
| 10 | Gem Mint / Pristine | Perfect or near-perfect. Sharp corners, perfect centering, zero surface issues. |
| 9 | Mint | Excellent condition with only the most minor imperfections under close inspection. |
| 8 | Near Mint – Mint | Very slight wear — a tiny edge nick or minor centering issue. Still stunning. |
| 7 | Near Mint | Light wear visible without magnification. Still a great-looking card. |
| 6 | Excellent – Mint | Moderate wear on corners or edges. Clearly used but well cared for. |
| 5 | Excellent | Noticeable wear throughout. Presentable but showing its age. |
| 1–4 | Poor to Very Good | Significant wear, creases, or damage. Value is in the card itself, not condition. |
For modern cards, a grade of 9 or 10 is what collectors chase. For vintage cards (pre-1990), an 8 can be exceptional.
Which Grading Companies Should I Know?
Several companies grade trading cards. Here are the most important ones:
PSA — Professional Sports Authenticator The most recognized name in card grading worldwide. PSA grades are the industry standard for both Pokémon and sports cards. A PSA 10 is the most sought-after designation in the hobby. Corridor Cards carries PSA graded cards.
TAG — Trading Card Authenticator & Grader A newer grading company with a reputation for fast turnaround and consistent grades. TAG uses the same 1–10 scale and produces quality slabs at accessible price points. Corridor Cards carries TAG graded cards.
BGS — Beckett Grading Services Beckett is the second-largest grading company and is particularly respected in the sports card world. BGS uses half-point grades (8.5, 9, 9.5) and a coveted BGS 9.5 Black Label for perfect subgrades.
CGC — Certified Guaranty Company Originally known for comic book grading, CGC has expanded into trading cards with strong credibility, especially in the Pokémon market.
SGC — Sportscard Guaranty A respected grader focused primarily on vintage sports cards. SGC slabs have a distinctive black label design.
What Cards Are Worth Grading?
Not every card is worth the cost of grading. Here's how to think about it:
Grade it if:
- The raw card is already worth $50 or more
- The card is in excellent condition (corners sharp, no visible scratches)
- It's a key card — a popular character, a rookie year, a rare print run
- You plan to sell it and want to maximize value
Skip grading if:
- The card has visible wear, creases, or damage — it won't grade high enough to justify the cost
- The raw card value is under $20 — grading fees will exceed the value gained
- It's a common card with no collector demand
How Much Does Grading Cost?
Grading fees vary by company and service tier. Faster turnaround costs more. Standard submissions through PSA typically run $20–$50 per card depending on the tier. TAG grading is generally more affordable for entry-level submissions.
At Corridor Cards, we offer grading submission assistance — we can help you evaluate whether your cards are worth submitting and walk you through the process.
Can I Buy Already-Graded Cards?
Absolutely — and that's exactly what we carry at Corridor Cards. Our graded card inventory includes PSA and TAG certified slabs across multiple grades, so you can own an authenticated card without the wait time of submitting yourself.
Every slab in our inventory is 100% verified — no cracks, no tampering, no questions.
Grading Glossary
Raw card — An ungraded card, not in a slab. Slab — The hard plastic case a graded card is sealed in. Pop report — The population report published by grading companies showing how many cards have been graded at each level. Centering— How well the card image is centered within the border. Measured as a percentage (60/40 is acceptable, 50/50 is ideal).Subgrades — Some companies (BGS) break the grade into four components — centering, corners, edges, surface — each graded separately. Crossover — Submitting a card already graded by one company to be regraded by another.Crack — Removing a card from its slab, usually to resubmit for a higher grade. PSA 10 — The holy grail designation in modern card grading. Gem Mint condition.