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Gem-Knight Master Diamond

Battles of Legend: Monster Mayhem (BLMM) · #39512984 · Ultra Rare · yugioh

Card: Fusion Effect Monster

ATK / DEF: 2900 / 2500 · Level 9 · EARTH

Archetype: Gem-

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.

DeckSpec Pricei

$0.19

Condition

Weighted composite · smoothed against one-off swings.

Current prices

Condition

normalNM

Cardmarket	≈$0.12	2026-08-09
coolstuffinc	$1.99	2026-08-09
ebay	$2.99	2026-08-09
TCGplayer	$0.21	2026-08-09

Non-USD sources (e.g. Cardmarket, EUR) are shown converted to USD at €1 ≈ $1.15 — indicative, not an exact quote.

Prices update daily · last checked Sun Aug 09. Indicative, not offers — how we price.

Price history (last 180 days)

Condition key

NM Near MintLP Lightly PlayedMP Moderately PlayedHP Heavily PlayedDMG Damaged

Recorded prices are Near Mint; LP–DMG are estimated from standard hobby multipliers (foils discounted more steeply) — a guide, not a market quote.

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Gem-Knight Master Diamond — card details

Rarity: Ultra Rare
Set: Battles of Legend: Monster Mayhem #39512984

Frequently asked questions

How much is Gem-Knight Master Diamond worth?

The DeckSpec price for Gem-Knight Master Diamond (Battles of Legend: Monster Mayhem) is about $0.19. Recent prices range from $0.12 to $2.99 across TCGplayer, Cardmarket and other sources. Prices are indicative and update daily.