What Affects Your Card's Grade: Centering, Corners, Edges & Surface

A grade isn’t one measurement — it’s a judgment across four condition factors. Knowing what each one is helps you predict how a card might grade and spot the problem that will hold it back.

1. Centering

How evenly the image sits inside the border, front and back, expressed as a ratio like 55/45. It’s the most common reason cards miss a gem-mint grade, and the one factor you can measure objectively at home. See PSA centering standards for the targets.

2. Corners

Graders examine all four corners under magnification for sharpness. Tiny dings, soft “mushy” corners, or whitening where the color has worn through drop the grade fast — corners are where handling damage shows first.

3. Edges

The card’s edges are checked for whitening, chipping, nicks, and rough cuts. Edge whitening (a thin white line along the border) is common on darker-bordered cards and is a frequent grade-limiter.

4. Surface

The largest area and often the hardest to judge: print lines, scratches, scuffs, indentations, staining, and print defects. Even a clean-looking card can have a scratch that only shows under raking light.

How they combine

Companies weigh all four and the final grade is generally held back by the worst factor — a card with flawless surface and corners but 63/37 centering can’t reach the top grade. Think of each factor as a ceiling: any one of them can cap the card. That’s why pre-grading means checking all four, not just the one that looks good.

What you can check yourself

• Centering — measurable with a tool or ruler.
• Corners & edges — visible with good light and a loupe; look for whitening and softness.
• Surface — tilt the card under a light to reveal scratches and print lines.

SlabWorthie estimates centering and gives you inspection aids for corners, edges, and surface so you can judge a card before paying to grade it — but it’s a hedged estimate, never a final grade. Next: is grading worth it? and corner & edge wear explained.