Houseki no Kuni Diamond Natsufuku Ver. by Otome no Yokubou presents Diamond with a gemstone-like presence. The figure captures Diamond's iconic icy luminance, with a translucent white body surface subtly tinted to mimic the gem's facets catching light from every angle. The sculpt emphasizes sharp facets along the limbs and torso, and a mirror-polished finish on the chest and shoulders to resemble kiln-cut crystal. Hair strands are finely carved, flowing around the head with delicate layering and a pale blue gradient that deepens at the tips. The pose is poised and attentive, one arm extended as if listening to the world, while the other rests near a crystalline base that resembles a shard of ice. The base is clear resin with frosted edges, enhancing the figure's ethereal quality. Overall, the figure radiates purity and quiet resolve, perfect for display in a glass cabinet.

Diamond is one of the living gems born from the cosmic forge in Houseki no Kuni. In the story, Diamond embodies clarity, resilience, and an intense inner light that contrasts with the harsh world where Lunarians threaten the gems. As part of a squad of ancient stones, Diamond participates in missions alongside other characters such as Phosphophyllite and Cinnabar, facing moral dilemmas, losses, and the cost of violence. The character's arc explores themes of identity, purpose, and what it means to be valuable when your role is fragile or misunderstood. Through trials and quiet moments of reflection, Diamond reveals a steady calm, a willingness to protect friends, and an evolution from a guarded, almost aloof demeanor to a more accepting, cooperative stance. The figure captures this essence: a luminous presence who stands as a beacon during the darkest battles.