Is Don Mattingly #28 worth grading?
Baseball · Baseball Cards 1993 Upper Deck Diamond Gallery · full price guide →
Strong grading candidate — 54× premium in PSA 10
A PSA 10 Don Mattingly #28 sells for $83.84 against $1.56 raw: a $82.28 spread, 54× the ungraded price. A PSA 9 ($18.91) 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)
- $1.56
- PSA 10
- $83.84
- PSA 9
- $18.91
- Gem premium
- 54×
- 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 | $83.84 | +$57.28 | +$32.28 | −$67.72 |
| PSA 9 | $18.91 | −$7.65 | −$32.65 | −$133 |
| PSA 8 | $9.10 | −$17.46 | −$42.46 | −$142 |
Net = sale price − $1.56 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% | $35.14 | −$16.42 |
| 50% | $51.38 | −$0.19 |
| 75% | $67.61 | +$16.05 |
Break-even gem rate at the standard fee: about 50%. 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 | $109 | best | 55/45 | 70/30 |
| PSA 10 | $83.84 | −$25.16 | 55/45 | 75/25 |
| CGC 10 | $50.00 | −$59.00 | 55/45 | 75/25 |
| SGC 10 | $50.00 | −$59.00 | 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 1993 Upper Deck Diamond Gallery cards worth checking
Full set checklist →Grading Don Mattingly #28 — FAQ
Is Don Mattingly #28 worth grading?
A PSA 10 Don Mattingly #28 sells for $83.84 against $1.56 raw: a $82.28 spread, 54× the ungraded price. A PSA 9 ($18.91) 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 Don Mattingly #28 worth compared with raw?
A PSA 10 Don Mattingly #28 (Baseball Cards 1993 Upper Deck Diamond Gallery) sells for about $83.84 versus $1.56 for a raw near-mint copy — a 54× premium as of Sep 4, 2026.
Which grading company is best for Don Mattingly #28?
By resale value, BGS 10 leads at $109, ahead of PSA 10 at $83.84. Fees and turnaround differ, so the best-paying label is not always the best net.
What centering does Don Mattingly #28 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 Don Mattingly #28 break even?
At a standard ~$50 fee, submitting Don Mattingly #28 breaks even when it gems about 50% of the time (a miss assumed to sell at the PSA 9 price of $18.91).
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