What is the name of the protagonist of the 2017 anime "Land of the Lustrous"?

The protagonist of the 2017 anime "Land of the Lustrous" is Phosphophyllite. They are a fragile and inexperienced gem who desires to be useful and take on important tasks. Throughout the series, Phos undergoes various transformations, both physical and mental, as they strive to find their purpose and protect their fellow gems in the ongoing battle against the Lunarians. Phosphophyllite's journey is a central focus of the story, making them the main character and the name of the anime adaptation.