Cornerstone Mask Ogerpon ex

Market prices

Cornerstone Mask Ogerpon ex 91/187 from Terastal Festival ex sells for $1.61 ungraded: the median of 8 completed sales over the last 90 days, as of October 1, 2026. Graded copies: PSA 10 at $7.65 (2 sales) and CGC 10 at $6.85 (1 sale).

Graded population: CGC 729 copies (78.6% in 10) and BGS 2 copies, as of October 1, 2026.

Ungraded

MedianRangeSales

30 days$1.70est.$1.70 – $1.702 sales

90 days$1.61$1.15 – $1.968 sales

Median by period. Short periods can rest on a handful of sales: the count is shown next to each price, and prices marked “est.” are indicative.

Graded Prices

PSA

PSA graded prices

Grade	Median	Sales
PSA 10	$7.65est.	2 sales

CGC

CGC graded prices

Grade	Median	Sales
CGC Pristine 10	$13.55est.	2 sales
CGC 10	$6.85est.	1 sale

TQG

TQG

TQG graded prices

Grade	Median	Sales
TQG 10	$3.43	4 sales

TAG

TAG graded prices

Grade	Median	Sales
TAG 10	$19.14est.	2 sales

Actual prices may vary.

Graded population report — Cornerstone Mask Ogerpon ex #91

Updated monthly · as of October 2026

CGC

729 graded · 78.6% in 10

Grade	Pop
Pristine 10	222
Gem Mint 10	351
9.5	26
9	86
8.5	25
8	17
7.5	1
6	1

0%25%50%

12345677.588.599.5GM10Pr10Pf10

BGS

2 graded

Grade	Pop
9.5	1
9	1

0%25%50%

1234567899.5Pr10BL10