Land of the Lustrous volume 2 features story and art by Haruko Ichikawa.

Phosphophyllite is determined to find a job more suited Cinnabar’s many talents, but with no easy answers to be found on land, the quest turns seaward. Ventricosus the sea snail suggests that the creatures who live there may have the clue Phos is looking for. But the sea is hardly the optimal environment for a gemstone—will Phos make it back to shore in one piece?