Pre-screening is the most important step in the grading process, and the most overlooked. Sending a card that will grade a 6 costs the same as sending one that grades a 10, so developing a sharp eye before you submit will save you serious money over time.
Preparing Your Workspace
You need a clean, hard surface, a strong direct light source, and clean hands or cotton gloves. A jeweller's loupe (10x magnification) is optional but dramatically improves your ability to spot corner and edge defects invisible to the naked eye.
Never examine a card under overhead fluorescent lighting. It flattens shadows and hides surface scratches, print lines, and edge chips that would be obvious under a direct LED or natural light source held at an angle. Bad lighting causes bad pre-screening decisions.
Avoid examining cards directly under an incandescent or halogen bulb. The heat can cause slight warping over time in thinner modern cards. LED is both cooler and clearer.
The single most useful tool for pre-screening. Reveals corner fraying, edge chips, and surface scratches invisible to the naked eye.
A high-CRI daylight LED held at a low angle is the gold standard for surface inspection. Avoid warm-toned bulbs; they mask defects.
Fingerprints leave oils that damage card surfaces and show up under grader inspection. Cheap insurance.
The Four Grading Criteria
Every major grading company evaluates the same four things: corners, edges, centering, and surface. A card's final grade is effectively the weakest of these four; one bad area drags everything down.
Corners
What to Look For
All four corners should come to a crisp point with no whitening, fraying, or blunting. Even a single soft corner can drop a card from a PSA 10 to a PSA 8. Check each corner individually; do not assume they are all the same condition.
Corner wear on the front of a card is weighted more heavily than the back by most graders. When you find damage, note which side it is on. Front corner wear is often the hard ceiling on your grade.
Edges
What to Look For
Run a loupe along all four edges looking for nicks, chips, or rough texture. Edge damage is especially easy to miss without magnification and is one of the most common reasons a card comes back lower than expected. Pay extra attention to the top and bottom edges where cards are most often handled.
Centering
What to Look For
Centering is measured as the ratio of the border on opposite sides. Most graders allow roughly 60/40 front and 75/25 back before penalizing. You can eyeball obvious miscuts, but a ruler gives you precise numbers to work from when a card is borderline.
Centering is determined at the factory and cannot be improved. If a card is badly miscut, no amount of cleaning or careful storage will fix it. A 70/30 miscut on a desirable card is worth submitting; an 80/20 almost certainly is not.
Surface
What to Look For
Tilt the card under a light and slowly rotate it 360°. Scratches, print lines, factory defects, and haze will catch the light at different angles. Surface issues are common on older cards and are often a hard cap on the final grade.
Making the Call
When to Submit
If all four criteria look strong under close inspection, the card is a candidate for submission. If two or more criteria show clear flaws, the card is unlikely to grade well enough to justify the cost.
The grading fee is non-refundable regardless of the grade you receive. A card you are not confident about is better left raw than submitted at a loss. When in doubt, don't.
Getting a Second Opinion
Post photos of borderline cards to communities like r/tradingcardcommunity or hobby Discord servers before committing to a submission. Experienced collectors can often call a grade range from good photos and save you the fee.
Pre-Submission Checklist
PSA's official breakdown of what separates each grade from 1 to 10. Essential reading before you submit anything.
Watching someone work through a real card under light teaches corner and surface detection faster than any written guide.