![Mike Piazza [Matrix] #31 (Baseball Cards 1997 Stadium Club) — is it worth grading?](https://i.ebayimg.com/images/g/Cj8AAeSwlhpqLIrV/s-l1600.jpg)
Is Mike Piazza [Matrix] #31 worth grading?
Baseball · Baseball Cards 1997 Stadium Club · full price guide →
Strong grading candidate — 31× premium in PSA 10
A PSA 10 Mike Piazza [Matrix] #31 sells for $155 against $4.95 raw: a $150 spread, 31× the ungraded price. A PSA 9 ($10.00) only about breaks even after fees, so the case rests on gemming. Centering is the usual reason a clean copy misses the 10 — measure it before you submit.
- Raw (NM)
- $4.95
- PSA 10
- $155
- PSA 9
- $10.00
- Gem premium
- 31×
- As of
- Jul 11, 2026
Break-even by outcome and fee
| If it comes back… | Sells for | Economy / bulk (~$25.00) | Standard (~$50.00) | Express (~$150) |
|---|---|---|---|---|
| Gem — PSA 10 | $155 | +$125 | +$100 | +$0.47 |
| PSA 9 | $10.00 | −$19.95 | −$44.95 | −$145 |
| PSA 8 | $9.50 | −$20.45 | −$45.45 | −$145 |
Net = sale price − $4.95 raw value − fee. Fee tiers are illustrative; plug your grader's current price into the calculator below.
Expected value — how often does it need to gem?
| Chance it gems | Expected sale | Expected net (standard fee) |
|---|---|---|
| 25% | $46.35 | −$8.60 |
| 50% | $82.71 | +$27.76 |
| 75% | $119 | +$64.11 |
Break-even gem rate at the standard fee: about 31%. Centering is the usual reason a clean copy misses — measure it before you decide.
Which grader pays the most — and what a 10 takes
All centering standards →| Grader | 10 sells for | vs best | Front centering for a 10 | Back |
|---|---|---|---|---|
| BGS 10 | $202 | best | 55/45 | 70/30 |
| PSA 10 | $155 | −$46.58 | 55/45 | 75/25 |
| CGC 10 | $93.00 | −$109 | 55/45 | 75/25 |
| SGC 10 | $93.00 | −$109 | 55/45 | 75/25 |
Tolerances are each company's published centering standard for its top grade; surface, corners and edges must also be clean. Centering is the one you can measure yourself before you pay.
Full grade ladder
Raw conditions & history →| Grade | PSA | CGC | BGS | SGC | Graded |
|---|---|---|---|---|---|
| 10 | $155 | $93.00 | $202 | $93.00 | — |
| 9.5 | — | — | — | — | $54.45 |
| 9 | — | — | — | — | $10.00 |
| 8 | — | — | — | — | $9.50 |
| 7 | — | — | — | — | $7.99 |
Run your own numbers
Should I pay this?
Enter the seller’s asking price to see your net outcome per grade.
Other 1997 Stadium Club cards worth checking
Full set checklist →
![Rickey Henderson [Members Only] #66 1997 Stadium Club card](https://i.ebayimg.com/images/g/rz4AAeSwHflqYk~9/s-l500.jpg)
![Chipper Jones [Matrix] #1 1997 Stadium Club card](https://i.ebayimg.com/images/g/BJYAAeSwKwBqT35V/s-l500.jpg)
![Ken Griffey Jr. [Matrix] #50 1997 Stadium Club card](https://i.ebayimg.com/images/g/SkkAAeSwYaxqWXM9/s-l500.jpg)
![Ken Griffey Jr. [Members Only] #50 1997 Stadium Club card](https://i.ebayimg.com/images/g/sBUAAOSwMZplGgup/s-l500.jpg)
Grading Mike Piazza [Matrix] #31 — FAQ
Is Mike Piazza [Matrix] #31 worth grading?
A PSA 10 Mike Piazza [Matrix] #31 sells for $155 against $4.95 raw: a $150 spread, 31× the ungraded price. A PSA 9 ($10.00) only about breaks even after fees, so the case rests on gemming. Centering is the usual reason a clean copy misses the 10 — measure it before you submit.
How much is a PSA 10 Mike Piazza [Matrix] #31 worth compared with raw?
A PSA 10 Mike Piazza [Matrix] #31 (Baseball Cards 1997 Stadium Club) sells for about $155 versus $4.95 for a raw near-mint copy — a 31× premium as of Jul 11, 2026.
Which grading company is best for Mike Piazza [Matrix] #31?
By resale value, BGS 10 leads at $202, ahead of PSA 10 at $155. Fees and turnaround differ, so the best-paying label is not always the best net.
What centering does Mike Piazza [Matrix] #31 need for a BGS 10?
BGS publishes 55/45 front and 70/30 back centering as the tolerance for a 10 (Gem Mint). Off-center copies are capped below the top grade regardless of surface — measure yours before paying the fee.
What gem rate makes grading Mike Piazza [Matrix] #31 break even?
At a standard ~$50 fee, submitting Mike Piazza [Matrix] #31 breaks even when it gems about 31% of the time (a miss assumed to sell at the PSA 9 price of $10.00).
Is your baseball card centered well enough to grade?
Centering makes or breaks a PSA 10. Scan any card with Midpoint to measure its exact centering, get a grade estimate, and see what your copy is actually worth.
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