ArtStation - The Crystal Onix

ArtStation - Resting With a Crystal Onix

ArtStation - Backgrounds for the intro The Crystal Onyx

let's see if Crystal Onix would evolve into Crystal Steelix

ArtStation - Onix

ArtStation - Backgrounds for the intro The Crystal Onyx

ArtStation - The Crystal Onix

Drusa de Gemas de Ônix - Objeto - World of Warcraft

Crystal Onix in his Cave by kitsune-roka on DeviantArt

Pokemon Trainer and his Crystal Onix : r/Pokemonart

ArtStation - Crystal Onix

ArtStation - Resting With a Crystal Onix

ArtStation - Noah Crowley

Pokemon Crystal Onix by StupidEchoingVoid on DeviantArt

Had a go at trying to 3D render the crystal onix from the anime, not perfect but I'm content : r/pokemon

Pit Baldriz - Onix