These four Carbink live in the Diamond Domain and serve as Diance's bodyguards. They all have nicknames. Three of them Allotrope, Merrick, and Bort, made their debuts in Diancie, Princess of the Diamond Domain, and the fourth one, Dace, made his debut in Diancie and the Cocoon of Destruction. Merrick and Dace have the power to communicate with people through telepathy like Diancie, whereas Allotrope and Bort don't. Merrick is the head of Diancie's bodyguards and he does everything he can to protect her, and at times, like in the beginning of the movie, gets annoyed by Diancie's childish attitude. Dace is the eldest of the Carbink and serves as the elder of the Diamond Domain. Like Merrick, Dace will at times get annoyed by Diancie when she doesn't take what he says seriously. Twice when Dace spoke to Diancie her response was "Okie-dokie" and he sternly advised her "A simple 'yes' would suffice."
None of Carbink's moves are known.