Cards › 2025 Bowman Hobby Stars Cooper Flagg #HS-3 Mini-Diamond Refractor

Is the 2025 Bowman Hobby Stars Cooper Flagg #HS-3 Mini-Diamond Refractor worth grading?

Live market numbers as of 2026-10-26 — raw vs. graded value, PSA 10 gem rate, and the breakeven math.

Raw value

$205.25

PSA 9 value

$328.01

PSA 10 value

$932.04

PSA 10 gem rate

14.3%

Based on the numbers below, this card is potentially worth grading — a PSA 10 nets an estimated $486, but the 14.3% gem rate means the 10 is far from guaranteed. Weigh the PSA 9 outcome below.

The breakeven math

Line item	Amount
Raw purchase	$205.25
Sales tax (8%)	$16.42
Grading fee (priority tier)	$80.00
Shipping	$5.00
Total cost basis	$306.67
Net at PSA 10 (85% payout)	+$485.56 (+158%)
Net at PSA 9 (the downside case)	−$27.86

Assumptions: $80 grading, $5 shipping, 8% tax on the raw purchase, and keeping 85% of the sale after marketplace fees. Your numbers will differ — run them below.

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Card pricing data provided by SportsCardsPro, a service of PriceCharting. Gem rates reflect recent PSA population data (7 graded submissions). Not investment advice — grading outcomes are probabilistic and markets move. © Summit Sports Cards · About · Pricing