Land of the Lustrous

is a manga written and illustrated by Haruko Ichikawa. It runs in Kodansha's Monthly Afternoon magazine. It is published in English by Kodansha Comics.

Plot
In the distant future, a new life form called the Lustrous are born. The 28 Lustrous must fight against the moon dwellers who want to attack them and turn them into decorations, and thus each gem is assigned a role such as a fighter or a medic. Though they hope to fight the moon dwellers, Phos is a gem who is given no assignment until the gems' master Kongo-sensei asks them to edit a natural history magazine.

Official

 * Official Anime Website
 * Official English Manga Website