Dioptase

Raw Dioptase Jewelry, Handmade in Japan

Explore TROZO's raw dioptase necklaces, ear cuffs and earrings — each built around a real, uncut dioptase rather than a cut and polished stone. Every piece is handmade in Japan, and as one-of-a-kind raw stone it is truly unique.

Dioptase is a hydrated copper cyclosilicate, Cu₆Si₆O₁₈·6H₂O, trigonal (R3̄), Mohs 5. Its color comes from the d–d transition of divalent copper (Cu²⁺), a deep emerald-to-teal green that rivals emerald itself. Found in the Altyn-Tyube mine of Kazakhstan in the 1780s, it was first mistaken for emerald until René-Just Haüy named it in 1797 (from the Greek *dia*, “through”, + *optos*, “seen”). It shares the very Si₆O₁₈ six-membered ring of emerald (Be₃Al₂Si₆O₁₈) — but with copper rather than beryllium linking the rings.

TROZO works every dioptase unpolished, setting it so its natural colour and form lead the design — handmade in Japan, and no two raw stones alike.