925 silver has been used to make this Koyomi Araragi-inspired ring set.
On the black ring is a mathematical formula engraved around a red stone, a color referring to his uniform.

The second ring has a simpler design and acts as one half in a set of couples rings: if you join it together with one of the Hitagi Senjyogahara rings, the symbolic Summer Triangle will become visible.

※Open rings allow for some size adjustment but please be aware that excessive adjustment may result in damage or deformation

Country of Origin / Japan
Composition / 925 sterling silver, glass