• This card is named after the mineral Aquamarine.
  • This monster's weapon is a bladed shield, likely based on its effect.
  • There is a small mark resembles a lightning under the gemstone on this monster's chest-plate. This is hinting that the Fusion partner of "Gem-Knight Sapphire" to form this monster is a Thunder-Type "Gem-Knight" monster. It is supported by some yellow trim on its armor, the same color as either "Gem-Knight Tourmaline" or "Gem-Knight Amber".