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- This card is named after Rock Crystal, also known as pure quartz or clear quartz.
- Just like how the "Elemental HEROes" and "Crystal Beasts" might have combined to form the "Gem-Knight" archetype, this card resembles a "Gem" counterpart to "Elemental HERO Neos".
- Both are Level 7 Normal Monsters.
- This card's ATK and DEF are both only 50 less than "Neos".
- This card's text bears a great resemblance to that of "Neos". This may imply that he can perform certain kinds of fusions with other "Gem-Knights" in the same way "Neos" can fuse with "Neo-Spacian" monsters.
- So far, this is the only "Gem-Knight" Normal Monster that no Fusion Monster lists as a Fusion Material.
- However, several subsequently released "Gem-Knight" Fusion Monsters very closely resemble "Crystal" and may be his fused forms. These are the following:
- Also, amethyst and citrine are a type of crystal.
- This monster appears in the artwork of "Fragment Fusion" and "Zefra Providence".
- This monster would eventually corrupt into "Cairngorgon, Antiluminescent Knight" and subsequently "El Shaddoll Grysta". Both have the same ATK and DEF as this card.