Beckett Grading Services (BGS) is the only major grader that publishes subgrades on every slab: Centering, Corners, Edges, and Surface, each on a 1–10 scale. The final grade is the lowest of the four, rounded according to Beckett’s published rules — never a simple average.
BGS’s top tier is the “Black Label”: a Pristine 10 where all four subgrades = 10. It’s rare and commands a 3–10× premium over a standard 10.
Centering tolerances by grade
| Grade | Name | Front | Back | Notes |
|---|---|---|---|---|
| 10P | Pristine | 50/50 | 75/25 | The "Black Label" floor — all four subgrades must be 10. |
| 10 | Gem Mint | 55/45 | 70/30 | Standard 10. Subgrades typically 9.5/10/10/10 or similar. |
| 9.5 | Gem Mint | 60/40 | 80/20 | Most common high grade. |
| 9 | Mint | 65/35 | 85/15 | One subgrade can sit at 8.5 and still total a 9. |
| 8.5 | NM-Mint+ | 70/30 | 90/10 | |
| 8 | Near Mint–Mint | 75/25 | 90/10 | Visible centering issue but otherwise clean. |
The subgrade formula
BGS doesn’t just average the four subgrades. They round based on the LOWEST subgrade plus the spread:
- All four = 10 → Pristine 10 (Black Label)
- 3 tens + 1 nine.5 → 10 (standard Gem Mint)
- Lowest = 9.5 with others at 9.5 or 10 → 9.5
- Lowest = 9, others ≥ 9.5 → 9.5
- Lowest = 9, others mixed → 9
In practice the centering subgrade is the most likely cap for modern cards (most have clean corners + edges out of pack), and the corner subgrade is the most likely cap for vintage.
How BGS measures vs PSA
Same physical measurement (printed border to card edge), same worst-axis rule. The big difference is that BGS gives you the score — you can see the 9.5 centering on the slab — while PSA rolls it up silently. For exactly that reason, BGS centering subgrades have become a real-money attribute: a BGS 9.5 with a 10 centering subgrade trades higher than a BGS 9.5 with an 8.5 centering subgrade.