Where do these graded prices come from?

Medians of 8 real eBay completed sales aggregated per grade (PSA, BGS, CGC) — a completed-sale evidence layer, not listing asks. Sample sizes are shown per grade; thin grades deserve caution.

Is grading Cornerstone Mask Ogerpon ex - 058/131 worth it?

Compare the graded medians below against the raw reference price of $1.01 and subtract grading fees. The CardIntel Grading ROI calculator runs this math with live numbers.

Graded Market · 8 completed sales

Cornerstone Mask Ogerpon ex - 058/131 graded prices.

As of August 19, 2026, Cornerstone Mask Ogerpon ex - 058/131 (Prismatic Evolutions #058) trades across the graded ladder below, based on 8 real eBay completed sales; the raw copy’s reference price is $1.01.

Across Prismatic Evolutions, PSA 10 copies sell for 45.0× their raw reference price on average (123 cards, 8,608 PSA 10 completed sales tracked).

As of August 19, 2026Raw price & chart →Grading ROI calculator →

PSA · Cornerstone Mask Ogerpon ex - 058/131

Grade	Median	Sales	vs Raw
Mint 9	$13.50	6	13.4×

Medians of real eBay completed sales per grade; small sample sizes deserve caution. Prices are dated reference values — cite them with the as-of date above. Attribution: CardIntel (cardintel.io). See the methodology.