Is Stephon Marbury [Quantum Bronze] #I29 worth grading?
Basketball · Basketball Cards 1998 Upper Deck Intensity · full price guide →
Strong grading candidate — 33× premium in PSA 10
A PSA 10 Stephon Marbury [Quantum Bronze] #I29 sells for $99.88 against $2.99 raw: a $96.89 spread, 33× the ungraded price. A PSA 9 ($22.33) 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)
- $2.99
- PSA 10
- $99.88
- PSA 9
- $22.33
- Gem premium
- 33×
- As of
- Sep 4, 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 | $99.88 | +$71.89 | +$46.89 | −$53.11 |
| PSA 9 | $22.33 | −$5.66 | −$30.66 | −$131 |
| PSA 8 | $11.12 | −$16.87 | −$41.87 | −$142 |
Net = sale price − $2.99 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% | $41.72 | −$11.27 |
| 50% | $61.10 | +$8.11 |
| 75% | $80.49 | +$27.50 |
Break-even gem rate at the standard fee: about 40%. 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 | $130 | best | 55/45 | 70/30 |
| PSA 10 | $99.88 | −$30.12 | 55/45 | 75/25 |
| CGC 10 | $60.00 | −$70.00 | 55/45 | 75/25 |
| SGC 10 | $60.00 | −$70.00 | 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.
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Other 1998 Upper Deck Intensity cards worth checking
Full set checklist →![Michael Jordan [Quantum Bronze] #I1 1998 Upper Deck Intensity card](https://i.ebayimg.com/images/g/-MYAAeSw7RtpltZk/s-l500.jpg)
Grading Stephon Marbury [Quantum Bronze] #I29 — FAQ
Is Stephon Marbury [Quantum Bronze] #I29 worth grading?
A PSA 10 Stephon Marbury [Quantum Bronze] #I29 sells for $99.88 against $2.99 raw: a $96.89 spread, 33× the ungraded price. A PSA 9 ($22.33) 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 Stephon Marbury [Quantum Bronze] #I29 worth compared with raw?
A PSA 10 Stephon Marbury [Quantum Bronze] #I29 (Basketball Cards 1998 Upper Deck Intensity) sells for about $99.88 versus $2.99 for a raw near-mint copy — a 33× premium as of Sep 4, 2026.
Which grading company is best for Stephon Marbury [Quantum Bronze] #I29?
By resale value, BGS 10 leads at $130, ahead of PSA 10 at $99.88. Fees and turnaround differ, so the best-paying label is not always the best net.
What centering does Stephon Marbury [Quantum Bronze] #I29 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 Stephon Marbury [Quantum Bronze] #I29 break even?
At a standard ~$50 fee, submitting Stephon Marbury [Quantum Bronze] #I29 breaks even when it gems about 40% of the time (a miss assumed to sell at the PSA 9 price of $22.33).
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