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  • The name "Ruby Carbuncle" is a double pun, since Carbuncle is also a type of gemstone, as well as a mythical creature, alleged to be seen in Latin America. Legends say the Carbuncle has some sort of jewel on its head.
    • It may also refer to a skin condition of the same name, which is a boil that bursts and leaks with pus. In an analogous sense, that is similar to the ruby (carbuncle) that breaks and reveals the monster when this monster is Summoned in the anime.
  • This card's name and appearance are similar to that of Carbuncle, a recurring summon in the "Final Fantasy" game series, in where Carbuncle is also known by its Ruby.
  • In the Yu-Gi-Oh! GX English dub, "Ruby Carbuncle" is the only "Crystal Beast" to not have a voice based on a celebrity; in fact it's also the only one to be incapable of human speech, instead making cat-like squeals.