Every Mega Diancie card we price, most valuable first. Prices are what copies actually sold for, updated daily.
The same Pokemon is also printed as Diancie, priced separately because the game treats them as different cards.
What a Mega Diancie card is worth
The most valuable Mega Diancie on this list is Mega Diancie ex from Ascended Heroes at $45.29£34.09€39.89, and the 3 priced copies across 2 sets are worth $52£39€45 together. Most of that sits in a handful of printings: the older the set and the scarcer the print run, the wider the gap to the rest.
Mega Diancie is printed in Japanese as well: 3 cards across 2 sets, the most valuable of them Mega Diancie ex from High Class Pack: MEGA Dream ex at $20.80£15.66€18.32. Switch the list above to Japanese to read those, or to Both to rank the two catalogues against each other.
The highest PSA 10 on record for Mega Diancie sold for $129.50£97.47€114.05. Rarities here include Special Illustration Rare.
If you are trying to identify which Mega Diancie you have, the set name is printed on the card and the collector number sits in the bottom corner. Open the card here and the page carries every printing of it, the graded prices, and whether grading the copy is worth the fee. Sets to start with: Ascended Heroes, Phantasmal Flames.