TV-Series
Description
Peridot is one of the elder gems in Land of the Lustrous, a mature and composed figure among the crystalline beings who inhabit a world threatened by the Lunarians. They have a lime-green color scheme, with short yellow-green hair, sharp thin eyes, and thin eyebrows, and they wear the summer or winter uniform depending on the season, along with black loafers. Their mineral hardness is 6.5, which is mid-range among the gems, giving them average but respectable combat capability rather than exceptional physical power.

Peridot is best known as the specialist in paper production, a role they carry with intense dedication and pride. Their craftsmanship is so absorbing that they are sometimes found buried in piles of paper, and their devotion to the craft is well known among the other gems. This artisan mindset shapes much of their behavior: they are precise, practical, and can be strict with younger gems, as shown when they scold Phosphophyllite for wasting paper. That strictness comes not from coldness but from a wish for the younger gem to grow. Other characters perceive Peridot as highly knowledgeable and composed; Hemimorphite describes them as smart and imperturbable. Their calm nature allows them to judge situations objectively and act with experience and level-headedness, which earns them the trust of their companions during patrols and battles.

Peridot's personal history is marked by loss and recovery. Their original partner, Blue Zoisite, was carried off by the Lunarians, and the loss consumed Peridot's thoughts for a long time. Over the years, however, they found themselves slowly forgetting the one they had lost, which troubled them with guilt and the fear that they were heartless. They eventually sought guidance from Kongo-sensei, who advised them that both grieving and forgetting are natural and should be accepted. This counsel helped Peridot make peace with their feelings. Around the same period, Sphene had suffered a similar loss, having lost their partner Topaz, and after both gems resolved their grief, they were assigned to patrol together and gradually built a new partnership. The bond between Peridot and Sphene is deep and mutually supportive, balancing Peridot's composed and sometimes stern demeanor with Sphene's warmer and gentler nature.

Within the story, Peridot functions as a supporting but meaningful presence. They serve as one of the elder gems who watch over the younger generation, and their professional skill in paper production gives them a clear role in the community's daily operations. In combat, they have shown willingness to sacrifice for others, once losing a finger protecting Sphene in a battle against a new type of Lunarian. In the course of major turning points, Peridot maintains their composure even under extreme threat: they acknowledge Phosphophyllite's leadership abilities in the middle of a crisis, later encourage Phos after the loss of a head, assist in restraining a rampaging Alexandrite, and gather information from Phos about the moon. When Phos later recruits others to accompany them to the moon, Peridot and Sphene choose instead to remain on the earth, carrying with them the memory of their former partners.

Peridot's development across the story moves from absorption in grief, through uncertainty about memory and identity, to acceptance and renewed purpose. They remain a figure of steady duty and quiet wisdom, defined by their artisan integrity, their loyalty to their partner, and their calm reliability in the face of loss and conflict. Their notable abilities include expert papermaking, competent combat performance suited to their mid-range hardness, and a sharp, experienced judgment that makes them a dependable elder among the gems.