ATTACK: 2900
DEFENSE: 2500
ATTRIBUTE: EARTH
CARD TYPE: Fusion/Effect Monster
DESCRIPTION: 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 and original effect become the same as that banished monster's.
MONSTERTYPE: Rock

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PRICE FAQ

What is Gem-Knight Master Diamond (Hidden Arsenal 7: Knight of Stars) worth today?

Gem-Knight Master Diamond [1st Edition] has a TCGplayer market price of $1.25 as of 2026-09-17. Across 2 tracked variants, latest prices range from $0.84 to $1.25.

What is the all-time high price for Gem-Knight Master Diamond?

In TickerMint's daily data (since September 2026), the all-time high market price for Gem-Knight Master Diamond [1st Edition] is $1.25 (2026-09-16) and the all-time low is $1.25 (2026-09-16).

What would a seller actually net for Gem-Knight Master Diamond?

The TickerMint Estimate for Gem-Knight Master Diamond is $1.25. It is a fee-adjusted fair value blending TCGplayer and eBay data to estimate what a seller nets after marketplace fees.

how these numbers are computed →

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