Cornerstone Mask Ogerpon ex

Terastal Fest ex · #91/187 · Double Rare · 2024JPN

$0.23
Market price ▼ 8.0% (30d)
Prices as of Aug 14, 2026
688graded pop
80%gem rate
84.3×PSA 10 vs raw
-18%off ATH $1.67 · May 2026
−$7.57EV to grade — don't
Market data

Price history

Holofoil▼ 14.8% 7d
Low $0.10Mid $0.40

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Graded market

Graded values

PSA 10 report →updated 2026-08-13
Grade 6 est.$1.30
Grade 5 est.$1.10
Grade 4 est.$0.90
Grade 3 est.$0.75
Grade 2 est.$0.62
Grade 1 est.$0.52

Grades 1–6 are estimates modeled from the raw price — PSA/CGC/BGS 7–10 and Ungraded are live tracked market values.

PSA 10 price history$19.38

PSA 10 chart is building — graded values are tracked nightly, a new point appears each day.

Graded population census · updated 2026-07-11

CGC649 graded · 522 gem 10
PSA39 graded · 28 gem 10

Population data from PriceCharting, updated monthly.

How much is Cornerstone Mask Ogerpon ex #91/187 worth?

Cornerstone Mask Ogerpon ex #91/187 is a Double Rare Japanese card from Terastal Fest ex (2024) — today it trades at roughly $0.23 ungraded.

Grading changes the math on this one: a PSA 10 is valued around $19.38, roughly 84.3x the raw price, while a PSA 9 sits near $10.81. 649 copies have been graded to date, and 80% of them came back a 10 — worth knowing before you pay grading fees.

These figures come from nightly market-data syncs verified against completed sales. Use the chart above to see the trend before you buy or sell.

Collecting Terastal Fest ex?Full master set guide — every card, chase list, and completion cost→

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