Yu-Gi-Oh! · Quarter Century Stampede

Gem-Knight Master Diamond (Platinum Secret Rare)

French name: Maître Diamant, Chevalier-Gemmes (Platinum Secret Rare)

RA04-EN178Platinum Secret Rare

Gem-Knight Master Diamond (Platinum Secret Rare) (Quarter Century Stampede RA04-EN178) has a market price of US$0.28 as of Nov 9, 2026.

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Price guide

The market price on TCGplayer, in US dollars: a guide, not an offer.

Market price

1st EditionUS$0.28Low US$0.15

As of Nov 9, 2026 · The market price is TCGplayer’s, in US dollars. It is a guide, not an offer.

Card details

Type: Fusion Monster
Level: 9
Attribute: EARTH
Monster type: Rock
Archetype: Gem-
ATK: 2,900
DEF: 2,500

Card text

3 "Gem-Knight" monsters Must first be Fusion Summoned. This card gains 100 ATK for each "Gem-" monster in your Graveyard. Once per turn: You can banish 1 Level 7 or lower "Gem-Knight" Fusion Monster from your Graveyard; until the End Phase, this card's name becomes that monster's, and replace this effect with that monster's original effects.

About this card

Gem-Knight Master Diamond (Platinum Secret Rare) is card RA04-EN178 in Quarter Century Stampede, a Yu-Gi-Oh! set released Apr 11, 2025. Rarity: Platinum Secret Rare. Finishes: 1st Edition. Reference market price on Nov 9, 2026: US$0.28. Over the last 30 days, the 1st Edition price went down 6.7%. Source: TCGplayer market data via tcgcsv.com, updated daily. A reference price is not an offer.