Coby Mayo [Red Diamante] #20 Price Guide
Baseball · Baseball Cards 2025 Topps
Coby Mayo [Red Diamante] #20 (Baseball Cards 2025 Topps) is currently worth $39.39 raw (near mint) (as of Sep 2, 2026). Values come from the PriceCharting price guide and are refreshed weekly. Grading is the single biggest value lever — check the raw-to-PSA-10 gap below, then scan your copy to see if its centering makes the grade.
These live in the Midpoint app for iPhone and Android. Free to start.
Current prices
Raw (ungraded)
| Ungraded | $39.39 |
Graded — grade ladder
Last updated 2026-09-02 · Source: the PriceCharting price guide
Shop this card on eBay ↗As an eBay Partner, Midpoint may earn commission from qualifying purchases.
Is it worth grading?
Worth grading — even a PSA 9 beats raw
A Grade 9.5 Coby Mayo [Red Diamante] #20 sells for $220 against $39.39 raw: a $181 spread, 5.6× the ungraded price. Even a PSA 9 ($200) clears the raw price after an economy-tier ~$25 fee, so a near-miss still comes out ahead. Centering is the usual reason a clean copy misses the 10 — measure it before you submit.
Full grading break-even for Coby Mayo [Red Diamante] #20: fee tiers, best grader, gem-rate math →
Should I pay this?
Enter the seller’s asking price to see your net outcome per grade.
More from 2025 Topps
Full set checklist →![Shohei Ohtani [Black Big Head Variation] #1 2025 Topps card](https://i.ebayimg.com/images/g/YCcAAeSwOQ5o-qo9/s-l500.jpg)
![Shohei Ohtani [Player Number Variation] #1 2025 Topps card](https://i.ebayimg.com/images/g/HN8AAeSwIX5qVtQq/s-l500.jpg)
![Corbin Carroll [Red Foil Flagship Real One Autograph] #78 2025 Topps card](https://i.ebayimg.com/images/g/bKQAAeSw~49qNtXk/s-l500.jpg)
![Freddie Freeman [Golden Mirror Image Variation] #239 2025 Topps card](https://i.ebayimg.com/images/g/dPgAAeSwt5BqMHOT/s-l500.jpg)
More Coby Mayo cards
All Coby Mayo cards →![Coby Mayo [Foilfractor] #20 2025 Topps card](https://i.ebayimg.com/images/g/NXQAAeSwqrFqoKBm/s-l500.jpg)
![Coby Mayo [Special Edition Red Ink] #ROA-CM 2025 Topps Heritage Real One Autograph card](https://i.ebayimg.com/images/g/LdMAAeSwiJppZDYU/s-l500.jpg)
![Coby Mayo [Red Refractor] #CRA-CM 2025 Bowman Chrome Rookie Autograph card](https://i.ebayimg.com/images/g/TUEAAeSwESto6SUJ/s-l500.jpg)
![Coby Mayo [Gold Sapphire] #RA-CMA 2025 Topps Chrome Rookie Autograph card](https://i.ebayimg.com/images/g/LgQAAeSwvEZqhyRF/s-l500.jpg)
Best on iPhone & Android
Check your baseball card in the Midpoint app
Scan with your camera to measure centering to the millimeter, get an AI grade with corner and edge close-ups, see what your copy is worth, and track it in your portfolio. Free to start.
Price alert
Watching this card? Set a line and Midpoint tells you the day the market crosses it — waiting to buy the dip or sell the spike.
Coby Mayo [Red Diamante] #20 — frequently asked
How much is Coby Mayo [Red Diamante] #20 (Baseball Cards 2025 Topps) worth?
As of Sep 2, 2026, Coby Mayo [Red Diamante] #20 (Baseball Cards 2025 Topps): an ungraded near-mint copy sells for about $39.39, a Grade 9.5 sells for about $220, a PSA 9 for about $200. Values come from the PriceCharting price guide and are refreshed weekly.
Is Coby Mayo [Red Diamante] #20 worth grading?
A Grade 9.5 Coby Mayo [Red Diamante] #20 sells for $220 against $39.39 raw: a $181 spread, 5.6× the ungraded price. Even a PSA 9 ($200) clears the raw price after an economy-tier ~$25 fee, so a near-miss still comes out ahead. Centering is the usual reason a clean copy misses the 10 — measure it before you submit.
Is Coby Mayo [Red Diamante] #20 going up or down in value?
Coby Mayo [Red Diamante] #20 (Baseball Cards 2025 Topps) is up 0% over the last 30 days (raw market). Short-term moves on individual cards are noisy — check the price history above for the trend.
Where do these Baseball card prices come from?
Prices are the PriceCharting price guide, refreshed weekly. Raw values reflect near-mint (NM) ungraded copies; graded values are per grading company and grade.