![Kenyon Martin [Refractor] #ZB4 (Basketball Cards 2002 Topps Chrome Zone Busters) — is it worth grading?](https://i.ebayimg.com/images/g/5OoAAeSwxUxqZJu3/s-l1600.jpg)
Is Kenyon Martin [Refractor] #ZB4 worth grading?
Basketball · Basketball Cards 2002 Topps Chrome Zone Busters · full price guide →
Strong grading candidate — 19× premium in PSA 10
A PSA 10 Kenyon Martin [Refractor] #ZB4 sells for $139 against $7.22 raw: a $132 spread, 19× the ungraded price. A PSA 9 ($31.21) 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)
- $7.22
- PSA 10
- $139
- PSA 9
- $31.21
- Gem premium
- 19×
- 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 | $139 | +$107 | +$82.13 | −$17.87 |
| PSA 9 | $31.21 | −$1.01 | −$26.01 | −$126 |
| PSA 8 | $16.49 | −$15.73 | −$40.73 | −$141 |
Net = sale price − $7.22 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% | $58.24 | +$1.02 |
| 50% | $85.28 | +$28.06 |
| 75% | $112 | +$55.09 |
Break-even gem rate at the standard fee: about 24%. 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 | $181 | best | 55/45 | 70/30 |
| PSA 10 | $139 | −$41.65 | 55/45 | 75/25 |
| CGC 10 | $84.00 | −$97.00 | 55/45 | 75/25 |
| SGC 10 | $84.00 | −$97.00 | 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.
Full grade ladder
Raw conditions & history →| Grade | PSA | CGC | BGS | SGC | Graded |
|---|---|---|---|---|---|
| 10 | $139 | $84.00 | $181 | $84.00 | — |
| 9.5 | — | — | — | — | $51.58 |
| 9 | — | — | — | — | $31.21 |
| 8 | — | — | — | — | $16.49 |
Run your own numbers
Should I pay this?
Enter the seller’s asking price to see your net outcome per grade.
Other 2002 Topps Chrome Zone Busters cards worth checking
Full set checklist →![Latrell Sprewell [Refractor] #ZB5 2002 Topps Chrome Zone Busters card](https://i.ebayimg.com/images/g/DicAAeSwf55qLhVc/s-l500.jpg)
![Shawn Marion [Refractor] #ZB7 2002 Topps Chrome Zone Busters card](https://i.ebayimg.com/images/g/asoAAeSwws5qT8MM/s-l500.jpg)
![Kobe Bryant [Refractor] #ZB8 2002 Topps Chrome Zone Busters card](https://i.ebayimg.com/images/g/Gv8AAeSwBP1qMIaI/s-l500.jpg)
Grading Kenyon Martin [Refractor] #ZB4 — FAQ
Is Kenyon Martin [Refractor] #ZB4 worth grading?
A PSA 10 Kenyon Martin [Refractor] #ZB4 sells for $139 against $7.22 raw: a $132 spread, 19× the ungraded price. A PSA 9 ($31.21) 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 Kenyon Martin [Refractor] #ZB4 worth compared with raw?
A PSA 10 Kenyon Martin [Refractor] #ZB4 (Basketball Cards 2002 Topps Chrome Zone Busters) sells for about $139 versus $7.22 for a raw near-mint copy — a 19× premium as of Jul 11, 2026.
Which grading company is best for Kenyon Martin [Refractor] #ZB4?
By resale value, BGS 10 leads at $181, ahead of PSA 10 at $139. Fees and turnaround differ, so the best-paying label is not always the best net.
What centering does Kenyon Martin [Refractor] #ZB4 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 Kenyon Martin [Refractor] #ZB4 break even?
At a standard ~$50 fee, submitting Kenyon Martin [Refractor] #ZB4 breaks even when it gems about 24% of the time (a miss assumed to sell at the PSA 9 price of $31.21).
Is your basketball 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.
Check my card free