It is not known to evolve into or from any other Pokémon.
Carbink is a gray, rock-like Pokémon with a conical body. Its body has light blue crystals of various shapes and sizes embedded in it. A white, fluffy collar surrounds its small head. It uses this soft mane to polish the gems of other Carbink. It has bright blue eyes, a light blue crystal on top of its head, and flat diamond-shaped ears. Due to its small stature, it ties with Minior and Dwebble as the shortestRock-type.
Carbink is created from high temperatures and pressures underground and is occasionally found during cave excavations. Following birth, it can sleep for millions of years. It is preyed upon by Sableye, and Gabite also likes to capture it. Carbink defends itself by shooting beams from the gem on its head. Rarely, Carbink will undergo a strange mutation and transform into Diancie. It is said that a pack of Carbink lives deep underground with their queen in a jeweled kingdom.
In the X & Y chapter, a group of Carbink lived in a cave near where Korrina, Gurkinn and Diantha camped as fugitives. A thief knocked out several of the Carbink inside the cave in order to steal the prized Diancie, but just as he made it out of the cave, he was stopped by the fugitive trio and eventually defeated by Diancie.
Carbink could be based on the carbuncle, a mythical fairy-like creature that was rumored to have gemstones growing out of it, and referring to its power to shoot rays or beams of light from the gem on its head. Its appearance is likely based on an ore, a type of rock that contains minerals with important elements which are valued for a high price.
Carbink may be a combination of carbuncle, carbon (element diamonds are composed of), carat, and tink (to tinkle).
Melecie may be a combination of melée (small cut diamonds), 珍しい mezurashii (rare), and 石 ishi (stone).