Land of the Lustrous (宝石の国 Hōseki no Kuni) is an anime series from 2017, directed by Takahiko Kyōgoku and animated by the studio Orange.
In a world inhabited by crystalline lifeforms called The Lustrous, every unique gem must fight for their way of life against the threat of lunarians who would turn them into decorations. Phosphophyllite, the most fragile and brittle of gems, longs to join the battle. When Phos is instead assigned to complete a natural history of their world, it sounds like a dull and pointless task. But this new job brings Phos into contact with Cinnabar, a gem forced to live in isolation.