Where do these graded prices come from?

Medians of 37 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 Dialga (Full Art Promo) worth it?

Compare the graded medians below against the raw reference price of $54.47 and subtract grading fees. The CardIntel Grading ROI calculator runs this math with live numbers.

Graded Market · 37 completed sales

Dialga (Full Art Promo) graded prices.

As of August 21, 2026, Dialga (Full Art Promo) (XY Black Star Promos #XY77) trades across the graded ladder below, based on 37 real eBay completed sales; the raw copy’s reference price is $54.47.

Across XY Black Star Promos, PSA 10 copies sell for 60.0× their raw reference price on average (52 cards, 912 PSA 10 completed sales tracked).

As of August 21, 2026Raw price & chart →Grading ROI calculator →

PSA · Dialga (Full Art Promo)

Grade	Median	Sales	vs Raw
Mint 9	$360.00	5	6.6×
NM-MT 8	$69.00	15	1.3×
NM 7	$59.00	7	1.1×
EX-MT 6	$43.50	6	0.8×

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.