SV: Prismatic Evolutions Cornerstone Mask Ogerpon ex 58/131: PSA 9 vs PSA 10
SV: Prismatic Evolutions Cornerstone Mask Ogerpon ex 58/131 shows a meaningful PSA 10 premium between PSA 9 and PSA 10: a $16 dollar gap, with the gem mint multiplier at 2.1x. Based on the last tracked PSA 10 sale of $30.00 on Feb 11, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$30.00
Last sale $30.00 on
PSA 9
$14.13
Last sale $14.00 on
PSA 8
$9.36
Last sale $9.36 on
The Spread
The PSA 9 to PSA 10 spread on Cornerstone Mask Ogerpon ex 58/131 (SV: Prismatic Evolutions).
$16
Dollar gap, PSA 9 to PSA 10
2.1x
PSA 10 sells for 2.1x a PSA 9
Three-Outcome EV Calculator
15%
70%
15%
Defaults are conservative starting points. Adjust based on the specific slab. A borderline 9 with strong centering plays differently than a 9 with edge wear.
PSA 10 outcome (sale price minus resub minus acquisition)
$0
PSA 9 outcome (regrade, no upgrade)
$0
PSA 8 outcome (downgrade, slower sell, tied capital)
$0
Expected Value
$0
Math favors holding the 9
SV: Prismatic Evolutions 58/131 Cornerstone Mask Ogerpon ex is a modern-era release from 2025. The gap between its PSA 9 and PSA 10 prices is $16.
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