Card Trivia:Gem-Knight Zirconia
- This monster is "Gem-Knight Crystal" after optimizing his Fusion capabilities and reaching the limits of his natural power.
- This monster's breastplate and right arm are attached to "Cairngorgon, Antiluminescent Knight".
- This card is named after Zirconium dioxide, sometimes known as "zirconia"; it is a white crystalline oxide of zirconium.
- Zirconia are often used to simulate an image of a diamond, meaning they are fake. Fittingly, this monster is an imperfect version of "Gem-Knight Master Diamond".
- This card has the same ATK and DEF as "Gem-Knight Master Diamond".
- Zirconia are often used to simulate an image of a diamond, meaning they are fake. Fittingly, this monster is an imperfect version of "Gem-Knight Master Diamond".
- This is the only non-Effect "Gem-Knight" Fusion Monster.
- Unlike the other "Gem-Knight" Fusion Monsters, this monster does not hold a weapon, having two large fists instead.
- This is based on the pattern of the "Gem-Knight" Fusion Monsters of having weapons related to their effects: since this card has no effects, this monster has no weapons.
- Unlike the other "Gem-Knight" Fusion Monsters, this monster does not hold a weapon, having two large fists instead.
- This is the first non-Effect Fusion Monster to not have any specifically named Fusion Material.