SGC centering standards: front, back and grade requirements

How do SGC 10 Pristine and Gem Mint differ?

The indexed official SGC scale, consulted on 2 October 2026, describes perfect centering for Pristine. The direct page did not expose a complete readable scale during this check. Centering Lab uses 52/48 as its practical perfect-centering convention, with approximate status for SGC. This is not an official allowance above perfect centering.

The modeled Gem Mint front band uses 55/45. At 55/45 on both axes the front ceiling is 10 Gem Mint; at 50/50 on both it is 10 Pristine. The label distinction also concerns the card's overall condition, which this tool does not inspect.

What SGC centering limits are available for each grade?

Bands are intentionally incomplete where numerical evidence is missing. Do not interpolate unlisted grades. Status applies to each row, not just to the house.

The front ratios come entirely from the approximate model, verified on 2026-10-01 with a supplied secondary reference rather than direct retrieval of the complete official scale. Empty grades are not filled by interpolation. Even where a ratio looks similar to another house's limit, that similarity is not evidence of an official SGC rule.

What does a dash in the SGC back column mean?

Every reverse entry is unmodeled. It does not mean SGC accepts any reverse, ignores the back or guarantees the front ceiling. Measuring the reverse still records its horizontal and vertical ratios; the engine simply cannot translate them into an independently evidenced SGC ceiling.

For example, the checker cannot assign a separate SGC reverse ceiling to 85/15 and 50/50. Its combined display remains constrained by the front only. Report that omission alongside the result, and consult SGC about the exact card rather than borrowing PSA's back allowance.

How should you measure sports and TCG cards for SGC?

Choose a continuous printed frame specific to the issue. On a traditional sports front, the photograph's outer frame may be clear; a nameplate, team emblem or intentionally uneven lower caption is not automatically a centered rectangle. For a TCG, artwork crossing a frame also does not define the cut. Compare the same treatment before placing inside lines.

Photograph the front and reverse squarely with four visible corners. Measure both axes outside rounded corners; preserve the worst reading along a slanted frame. Do not average a poor vertical axis with a centered horizontal one. At 60/40 and 50/50 the modeled front ceiling is 9 Mint, irrespective of which axis is wider.

Which conclusions should an SGC check avoid?

Do not call approximate ratios official requirements, predict a final label from centering or infer that a reverse passes because the table is empty. Keep placement uncertainty when close to a limit. Gloss, refractor lines, corner wear and authenticity require separate inspection.

The standards hub keeps SGC next to the other models with status labels. The measurement guide explains reproducible border placement, and the front/back guide explains why a missing reverse model differs from a generous known reverse tolerance.

Frequently asked questions