The Short Answer
- Card grading scale runs 1-10 with 10 being Gem Mint/Pristine condition
- PSA 10 requires 55/45 centering; BGS 9.5 allows 60/40 centering
- BGS uses sub-grades (Centering, Corners, Edges, Surface) for more detail
- PSA 10 typically worth 3-4x more than PSA 9 for modern cards
- Cards graded below 8 often sell for less than raw value
The 1-10 Card Grading Scale
The card grading scale is 1-10 with higher numbers indicating better condition. All major companies (PSA, BGS, SGC, CGC) use this scale but standards vary slightly.
Scale by Company
| Company | Highest Grade | Sub-Grades? |
|---|---|---|
| PSA | 10 Gem Mint | Optional |
| BGS | 10 Black Label | Yes (4) |
| SGC | 10 Gem Mint | No |
Only 3-5% of modern cards submitted to PSA earn Gem Mint 10. The difference between grades can mean thousands of dollars in value.
Grade 10: Gem Mint Standards
PSA 10 Requirements
- Centering: 55/45 or better on front
- Corners: No visible wear under 5x magnification
- Edges: No chipping or whitening
- Surface: No scratches visible under direct light
BGS 10 Black Label
Requires four perfect 10 sub-grades (10/10/10/10). Achieved by less than 0.5% of cards. Commands 2-5x premiums over PSA 10.
BGS 9.5 vs PSA 10
BGS 9.5 allows 60/40 centering (vs PSA's 55/45). Only 40% of BGS 9.5s earn PSA 10 when crossed over. BGS 9.5 is closer to PSA 9 in strictness.
Grade 9 vs Grade 10
PSA 9 Mint Standards
- Centering: 60/40 to 65/35
- Corners: Minor rounding under magnification
- Edges: Very minor chipping allowed
- Surface: One minor flaw allowed
Value Gap: 9 vs 10
| Card | PSA 10 | PSA 9 | Gap |
|---|---|---|---|
| Zion Prizm RC | $1,200 | $350 | -71% |
| Ja Morant Prizm RC | $800 | $220 | -73% |
The 9 to 10 gap is massive — typically 70% value loss. This is why pre-screening with AI before submitting to PSA is essential.
How Companies Differ
PSA
- Market standard for vintage
- 10 commands highest premiums
- No half-points
BGS
- Sub-grades standard
- 9.5 easier than PSA 10
- Black Label 10 is holy grail
SGC
- Strict vintage grading
- Tuxedo slab design
- 10 equivalent to PSA 10
Cross-Grade Equivalents
| PSA | ≈ BGS | ≈ SGC |
|---|---|---|
| 10 Gem Mint | 9.5 (True Gem) / 10 | 10 |
| 9 Mint | 9 / 9.5 | 9 |
Value by Grade
Grade Multipliers (vs Raw)
| Grade | vs Raw | vs PSA 10 |
|---|---|---|
| 10 Black Label | 5-10x | 2-4x |
| 10 Gem Mint | 3-5x | 1x |
| 9 Mint | 1.5-2x | 25-35% |
| 8 NM-MT | 1.1-1.3x | 15-20% |
| Below 7 | 0.5-0.8x | < 10% |
Understanding the grading scale helps identify which cards are worth grading. Grades below 8 often sell for less than raw value on modern cards.
Frequently Asked Questions
What is the card grading scale?
What does PSA 10 mean?
Is BGS 9.5 the same as PSA 10?
What is the difference between grade 9 and 10?
What is BGS Black Label?
Is it worth grading a card that will get grade 8?
Sources & Further Reading
Marcus Chen has evaluated over 50,000 sports cards and TCG cards across PSA, BGS, SGC, and CGC standards. Before joining PreGradeCards, he worked as a submission specialist for a major grading company and trained collectors and dealers on condition assessment.
With submission floors rising, pre-screening is no longer optional. Use our AI Pre-Grade Calculator to score a card's PSA 10 odds before you pay, and the Submission Planner to pick the right tier.