When PSA cracks open your submission and puts your card under the magnifying loupe, they are evaluating exactly four attributes: centering, corners, edges, and surface. Each of these four categories receives its own sub-grade assessment, and together they determine the final number that ends up on that tamper-evident label. A 1952 Topps Mickey Mantle with razor-sharp corners but badly off-center printing is not getting a PSA 10, no matter how pristine it looks at first glance.
Every flaw detected in any of the four categories pulls the overall grade down, and understanding how PSA weighs each one gives you a serious advantage before you ever drop your card in a submission envelope. This article breaks down each of the four grading criteria in detail, explains how they interact with one another, and covers the real-world nuances that trip up collectors. We will look at how centering percentages actually work, what PSA considers acceptable corner wear versus a downgrade, how edge issues manifest differently on foil versus standard cards, and why surface problems are the hardest to detect before submitting. Whether you are prepping a modern Pokémon pull or a vintage WOTC holo for grading, knowing what PSA’s graders are actually looking for can save you money and set realistic expectations.
Table of Contents
- What Are the Four Grading Criteria PSA Uses to Score Your Card?
- How Centering Percentages Determine Whether Your Card Hits a PSA 10
- Why Corner Sharpness Is the Most Obvious Make-or-Break Factor
- How to Evaluate Edge Condition Before Submitting to PSA
- Surface Flaws Are the Hardest to Detect and the Easiest to Underestimate
- How PSA’s Four Criteria Work Together to Produce a Final Grade
- Getting Better at Self-Grading Before You Submit
- Conclusion
- Frequently Asked Questions
What Are the Four Grading Criteria PSA Uses to Score Your Card?
PSA’s grading framework rests on centering, corners, edges, and surface. These four pillars have remained consistent for decades, and every card that passes through their facility in Santa Ana gets scrutinized across all four. Centering refers to how well the printed image is positioned within the card’s borders. Corners evaluates the physical sharpness of each of the card’s four corner points. Edges covers the condition along the entire perimeter between those corners.
Surface encompasses everything on the face and back of the card, from print quality to scratches to staining. What makes PSA’s system distinct from competitors like BGS is that PSA does not publish individual sub-grades by default. Beckett famously breaks out each category with a visible sub-grade on the label, but PSA rolls everything into a single final number on a 1-to-10 scale. PSA did introduce a sub-grade option called PSA Registry Set holders and later their PSA DNA and half-point grades, but the standard slab shows only the overall grade. This means a PSA 8 could be a card with four roughly equal areas of minor wear, or it could be a card with near-perfect corners, edges, and surface that got dragged down by terrible centering. For a collector trying to understand why a card received a specific grade, knowing the four criteria and how to self-assess them is essential.
How Centering Percentages Determine Whether Your Card Hits a PSA 10
centering is measured as a ratio comparing the borders on opposite sides of the card. PSA evaluates both the left-to-right and top-to-bottom centering independently. For a PSA 10 Gem Mint grade, centering must fall within 60/40 or better on the front and 75/25 or better on the back. A PSA 9 Mint allows up to 65/35 on the front and 90/10 on the back. These percentages sound generous until you start actually measuring your cards. A border that looks even to the naked eye can easily measure 62/38 under a ruler, and that alone can be the difference between a 9 and a 10.
However, centering standards apply differently depending on the era and type of card. Vintage Pokémon cards from the WOTC Base Set era, printed by Wizards of the Coast through their arrangement with Japanese manufacturer Media Factory, are notorious for inconsistent centering. PSA graders understand this historical context, but they do not apply a separate centering curve for vintage cards. The numbers are the numbers. If you have a 1999 Base Set Charizard that is visibly shifted to the left, the centering alone may cap your grade at a 7 or 8 regardless of how clean the rest of the card is. Full-art cards and borderless modern cards from Sword and Shield or Scarlet and Violet sets present a different challenge: with no visible border, centering is measured by the cut placement relative to the printed design, which makes self-assessment harder. Hold the card up to a light source and look at the back borders to estimate centering before submitting.
Why Corner Sharpness Is the Most Obvious Make-or-Break Factor
Corners are the first thing most collectors check when evaluating a card’s condition, and for good reason. PSA graders examine each of the four corners under magnification looking for any rounding, fraying, dings, or whitening. On Pokémon cards, which have a dark blue back border, even microscopic corner wear shows up as a white dot or fuzzy edge that is impossible to hide. A card that has been sitting unsleeved in a binder for years will almost always show corner softening, even if the owner considers it “mint.” For a PSA 10, all four corners need to appear sharp and perfect under magnification. One slightly dinged corner on an otherwise flawless card will typically bring the grade down to a PSA 9 at best.
The practical reality is that many cards arrive from the pack with minor corner imperfections due to the cutting process. Modern Pokémon cards produced by The Pokémon Company International are die-cut in large sheets, and the cutting equipment does not always produce perfectly clean corners across every card in a print run. This is particularly common with Japanese cards, where the card stock tends to be thinner and more prone to corner softness straight from the pack. If you pull a card and immediately sleeve and top-load it, you have the best chance of preserving corner integrity, but even then, some cards are simply born with a corner that will not pass a PSA 10 threshold. Checking corners with a jeweler’s loupe before submitting can save you the grading fee on a card that was never going to ten.
How to Evaluate Edge Condition Before Submitting to PSA
Edges are related to but distinct from corners. While corners focus on the four points, edges cover the entire length of each side of the card. PSA graders look for chipping, rough cuts, dents, peeling of the card layers, and whitening along the edges. On foil and holographic Pokémon cards, edge wear can manifest as a separation of the foil layer from the cardboard substrate, creating a visible silver line along the card’s perimeter. This is different from the white border wear you see on standard cards, and it tends to be more obvious under certain lighting angles.
The tradeoff with edges is that some types of damage are fixable through careful handling, while others are permanent. A card with a minor paper fiber sticking up from an edge can sometimes be gently addressed, though any attempt to alter a card’s condition is considered trimming by PSA and will result in an automatic “Altered” designation rather than a numerical grade. This is not a trivial risk. PSA has become increasingly sophisticated at detecting trimmed cards, using measurements against known card dimensions for that specific set. If your card’s edges are rough, the honest move is to accept a lower grade rather than risk an “Altered” label, which destroys the card’s graded market value entirely. Cards from older print runs, especially early WOTC sets, often exhibit natural edge roughness that is a product of the era’s cutting technology, and PSA graders do take this into account to some degree, but there is no formal published allowance for it.
Surface Flaws Are the Hardest to Detect and the Easiest to Underestimate
Surface grading is where submissions most often produce surprises. PSA evaluates the entire front and back surface for scratches, print lines, ink spots, creases, staining, fading, and any other imperfection. The problem for collectors is that many surface flaws are nearly invisible unless you hold the card at precisely the right angle under direct light. Holographic cards are especially tricky because the reflective foil can hide scratches that only appear when light hits at a specific angle. A Base Set holographic Venusaur might look flawless in your hand but reveal a network of fine surface scratches under PSA’s controlled lighting setup. Print defects are a particularly frustrating category because they come from the factory and have nothing to do with how the card was handled.
Print lines, which appear as faint raised or recessed lines running across the holographic portion of a card, are endemic to certain Pokémon sets. Modern V and VMAX cards are prone to print lines that run horizontally across the textured surface. PSA treats factory print defects the same as handling damage when it comes to the surface grade. A print line is a print line, regardless of whether you caused it or the factory did. This means you need to inspect the surface of every card under a strong, direct light before submitting. Tilt the card slowly under a bright LED source and watch the reflections move across the surface. Any scratch, line, or irregularity that catches the light will catch the grader’s eye too.
How PSA’s Four Criteria Work Together to Produce a Final Grade
PSA does not use a simple average of the four categories. The final grade reflects the overall impression of the card, weighted by the severity of the worst flaw. A card with three perfect categories and one significantly flawed one will be graded based heavily on that weak link.
For example, a Pokémon card with immaculate corners, edges, and surface but 70/30 centering on the front will likely land at a PSA 7 or 8, because the centering alone places it outside the acceptable range for higher grades. Conversely, a card with very minor issues spread evenly across all four categories might still earn a PSA 8 or 9, because no single attribute is severely compromised. This is why experienced submitters learn to evaluate their cards holistically rather than fixating on one attribute. The card needs to pass all four tests simultaneously, and your grade is largely determined by whatever category scores the lowest.
Getting Better at Self-Grading Before You Submit
The grading hobby has matured to the point where self-assessment tools are widely available. Centering tools, both physical templates and phone apps, can give you a quick ratio check. Jeweler’s loupes in the 10x to 30x range let you inspect corners and edges the way a grader would. Strong directional lighting reveals surface issues.
None of these replace PSA’s trained eye and standardized environment, but they dramatically reduce the number of cards you submit that come back lower than expected. Given that PSA’s grading fees range from around ten dollars at economy tier to hundreds for faster turnaround, pre-screening your cards against all four criteria is not just smart collecting, it is basic financial sense. The collectors who consistently get PSA 10s are not luckier than everyone else. They are just better at knowing which cards to send.
Conclusion
PSA’s grading process comes down to four attributes: centering, corners, edges, and surface. Each one matters independently, and the weakest of the four will anchor your final grade more than the strongest will lift it. Understanding the specific thresholds for each, such as the 60/40 centering requirement for a Gem Mint 10 or the zero-tolerance policy on corner dings at the highest grades, allows you to set realistic expectations and avoid wasting money on submissions that were never going to hit the grade you wanted.
Before you submit your next batch of Pokémon cards, spend the time to evaluate each one against all four criteria under proper lighting and magnification. The grading fee is only worth paying when you have a reasonable belief the card will hit the grade that makes economic sense. Cards you are on the fence about are usually better kept raw or submitted at economy pricing. The four-category framework is not a secret, but the collectors who internalize it and apply it consistently are the ones building collections full of high grades.
Frequently Asked Questions
Does PSA grade the front and back of the card separately?
PSA evaluates both sides for all four criteria. Back centering has more lenient thresholds than front centering, but corner, edge, and surface flaws on the back count against the grade just as they do on the front.
Can a card with a factory defect still get a PSA 10?
It depends on the defect. Minor factory variations may be overlooked, but visible print lines, ink dots, or surface irregularities are treated as flaws regardless of their origin. A card with a noticeable print line will almost never receive a 10.
Does PSA grade Pokémon cards differently than sports cards?
The same four criteria apply across all card types. However, different card stocks, printing methods, and foil treatments mean that certain flaws are more common in Pokémon cards than in, say, baseball cards. PSA graders are trained to recognize the characteristics of each card type.
Is it worth regrading a card if I think PSA made a mistake?
PSA offers a review service where you can request a regrade. Grades can go up, stay the same, or go down. If you believe a card was undergraded due to a specific oversight, a review can be worthwhile, but be aware that the card could also come back lower on a second look.
How much does centering alone affect the grade?
Centering can cap a grade by itself. A card with 70/30 or worse front centering is essentially locked out of PSA 9 or 10 territory, no matter how perfect the other three categories are. For valuable cards, centering is often the first thing to check before investing in a submission.
