Gem-Knight Master Diamond | Deck and Rulings

This page notes details of Gem-Knight Master Diamond (EARTH/Rock/Fusion Monster/Effect Monster) : decks, tips, effect and rulings. Learn and enjoy playing Yu-Gi-Oh! Duel Links!
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update 21/05/2020

Gem-Knight Master Diamond

Gem-Knight Master Diamond
Monster TypeRock
Card typeFusion / Effect
Card Effect TypeSummoning condition / Continuous Effect / Ignition Effect
ArchetypesGem- / Gem-Knight
Supports ArchetypesGem- / Gem-Knight
SupportsFusion Monster


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.

How to Get

PackPrimal Burst [UR]
Level-up reward--
Victory against--
Card trader--




  • Great ATK and DEF stats.
  • Banishes 1 level 7 or lower “Gem-Knight” Fusion monster from your Graveyard to allow this card to gain the banished monster’s effect. This effect is optional.


  • Must use 3 “Gem-Knight” monsters for a Fusion summon.
  • Its effect can be challenging to use since it requires “Gem-beast” Fusion monsters in the graveyard.


  • You can utilize any 1 of the Gem-Knight Fusion Monsters effect depending on situation, since you can only put a maximum of 5 cards in Extra Deck.

Gem-Knight Fusion Monsters

Gem-Knight Master Diamond can use any one of these Fusion monster’s effect as though the effect is its own, if it banishes that Fusion monster from the Graveyard. Gem-Knight Prismaura’s effect allows you to destroy 1 face-up card on the field by discarding 1 “Gem-Knight” monster from your hand to the Graveyard. Gem-Knight Seraphinite’s effect allows you to perform an additional Normal Summon/Set 1 monster for that turn. Gem-Knight Ruby’s effect allows you to tribute 1 “Gem-Knight” monster on the field to gain ATK equal to the tributed monster’s ATK until the End Phase. Additionally, if Gem-Knight Master Diamond attacks a defense position monster, inflict piercing damage to your opponent. Gem-Knight Topaz’s effect allows you to attack twice during your Battle Phase, and at the same time, if it destroys an opponent’s monster, inflict damage equal to that destroyed monster’s ATK to your opponent. Gem-Knight Citrine’s effect will prevent your opponent from activating cards or card effects when Gem-Knight Master Diamond attacks, or is being attacked, until the End Phase.

Fusion Support

Since you are most likely to perform a considerable amount of Fusion summons to get to use Gem-Knight Master Diamond’s effect, you can use these cards to support your Fusion actions. Fusion Recycling Plant can recycle 1 fusion material monster to your hand, and also search for Polymerization from your deck. King of the Swamp can be treated as 1 fusion material required for Fusion Summon, and at the same time it also can be used to search 1 Polymerization from your Deck. Fusion Sage can search 1 Polymerization from your deck.

Set skill

[Skill] descriptionUser
Fusion Time!
Can be used each time your Life Points decrease by 1500. In the Draw Phase, instead of doing a normal draw, Polymerization spell card, from outside of your Deck, is added to your hand.

Master of Fusion
Can be used each time your Life Points decrase by 1800. In the Draw Phase, instead of doing a normal draw, one Polymerization Spell Card, from outside of your Deck, is added to your hand.





Banished categoriesBanishes from Graveyard for cost
Summoning categories3 Fusion Materials / Semi-Nomi
Stat changesThis card gains ATK / Treated as alternate name / Variable effects


Got my 2nd copy with 500 gems, and it was a glossy one =D
Gem Knight FTK surprised me this day. Damn, glad to see they are back, diversity is all this game needs to keep being fun. Screw all the haters, they don't know anything about Yu-Gi-Oh!
<< Anonymous
Anonymous Reply
Diversity is important. But a deck like this adds nothing to anyone's enjoyment of the game, neither the people playing it or playing against it. There's a reason why things like Woodland Sprite and Karate Man got axed fairly quickly.
<< Anonymous
Anonymous Reply
That's you opinion.
Nothing important.
Next time make a stream at least 2 hours long and then see it for yourself if you get FTK so frequently. Otherwise, your words will always be GARBAGE.
Give us Brilliant Fusion :3
Mamma mia !
Use him on Lady Lapis, if you recycled any obsidian or lazuli he is easy af to summon and use
Is he limited? And by how much because this card is on the current ban list?
<< Anonymous
Anonymous Reply
It's (about to be) limited in the TCG due to some OTK/FTK loops involving cards that don't (and won't for a long, long time) exist in Duel Links. It won't affect things here.

Worth pointing out Cyber-Stein is limited in the OCG and banned in the TCG, but unlimited here. ;p
After reading the card description, I'm not going to wait around to get this guy before I make a gem knight deck now that I have everything else. HE can wait instead.
He's very easy to summon with Fragment Fusion. You can then use Re-Fusion or even better Puzzle Reborn to bring him right back.

Even if you don't want to bother with that, he's still great for one turn with Fragment Fusion to take out a powerful monster
Try this
the thing is, you can use a fusion gem knight as the materiel for diamond. so open with ruby or topaz, then fuse with two others. ruby or topaz is in your grave yard, and diamand has plenty in the grave to boost attack. not saying its easy. i just think thats the best way to go about it.
3 gem knights monsters!!! Aimt nobody got time for that
<< Anonymous(Kaiser)
Anonymous Reply
Not to mention you already have to have a gem knight fusion monster in your GY to even use its effect!!!
<< Anonymous
Markmagican2 Reply
I still win with the 3200 attack points.its not that hard to do!
I always have time to make Diamond.

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