Land of the Lustrous follows a race of immortal, humanoid gemstones who defend their island home from the Moon People, mysterious beings that seek to shatter them for use as decorations. The story centers on Phosphophyllite, the youngest and weakest gem, who longs to be useful despite their fragile body. After a series of events, Phos gains a unique ability that lets them grow stronger, but also uncovers hidden truths about the gems' past, their purpose, and the nature of their enemies. Readers enjoy the series for its stunning art, deep themes of identity, loss, and transformation, and its emotional, unpredictable plot that slowly reveals a complex and tragic world.