This figure presents Diamond in a poised, statuesque stance that echoes her crystallized identity in Houseki no Kuni. The model captures the gem’s pale, pearlescent tones with an almost translucent glaze that shifts under light, revealing multiple micro-facets along limbs and torso. The head features clean, angular lines and the signature gem cut that reflects a spectrum of blues and milky whites. Clothing is minimal, allowing the crystalline body to read with subtle color variation and mineral-like texture. The base is designed to resemble a shattered mineral surface, complementing Diamond’s quiet, introspective presence. Fine pinstripe detailing and light-weathering effects enhance depth without overpowering the figure. Overall, the sculpture conveys a sense of calm concentration, an almost fragile elegance that feels both otherworldly and intimately human in its expressiveness. The pose suggests readiness and resilience in the face of danger.

Diamond is one of the young gems who navigates a world of constant threat from Lunarians while trying to understand what it means to be a person among sentient stones. She begins as a practical, composed member of the team, often balancing others' impulsiveness with patient analysis. Over time, Diamond's experiences with Phosphophyllite and the other gems reveal hidden desires and questions about purpose, memory, and self-worth. Her dialogue is thoughtful, and she seeks to align action with a personal sense of ethics and care for her companions. Through battles and discoveries, Diamond learns to trust her own voice, even as she faces the fragility of existence and the possibility of change. The character's arc is about growing beyond a defined role, embracing vulnerability, and contributing to the group’s survival with quiet strength and resolve.