Quick answer
Before you submit a Pokémon card for grading, inspect four things under bright light and magnification: centering, corners, edges, and surface. Most grading disappointments can be spotted before the card ever leaves your desk.
Tools you need
Use a clean microfiber cloth for your workspace, fresh penny sleeves, semi-rigid holders, bright indirect light, a small LED light, and a 10x loupe. CGC’s Gem Mint language specifically references how corners appear under 10x magnification, which makes a loupe a useful pre-screening tool even if you ultimately submit to PSA. CGC grading scale
Point 1: Centering
Measure the left-right and top-bottom borders on the front. PSA’s published Gem Mint 10 tolerance says front centering should not exceed approximately 55/45, with reverse centering not exceeding 75/25. CGC lists similar approximate centering for Gem Mint 10. If the card obviously fails the front centering test, do not assume clean corners will rescue a PSA 10. PSA grading standards
Point 2: Corners
Look at all four front corners, then all four back corners. Under a loupe, watch for white dots, lifted paper fibers, tiny bends, hooks, chips, and corner compression. A card can look pack fresh in a sleeve and still show a corner issue once light hits it from the side.
Point 3: Edges
Tilt each edge slowly under light. Pokémon cards often show whitening, rough cuts, foil chipping, and tiny nicks on the back border. Edge wear is especially important on dark-backed cards because small flaws are easier for graders and buyers to see.
Point 4: Surface
Surface flaws are the silent grade killer. On holo cards, rotate the card under light to find print lines, scratches, dimples, dents, roller marks, ink spots, and clouding. A dent usually hurts more than a tiny print dot because it changes the card’s physical structure.
Red flags that should stop a submission
Pause before grading if you find a dent, crease, indentation, heavy holo scratching, obvious whitening, severe off-centering, stains, residue, or evidence of trimming or alteration. These flaws can destroy the economics even if the card is popular.
Create a grading notes log
Record each card’s estimated grade, observed flaws, raw value, expected PSA 9/10 or CGC 9.5/10 value, and submission cost. This turns pre-screening from guesswork into repeatable grading discipline.
Bottom line
A loupe will not guarantee a grade, but it will keep obvious misses out of your submission. The best graders are not lucky—they reject weak candidates before fees are paid.