THE GEMSTONE LIBRARY
Chrome Diopside
The green pyroxene mineral, including our Chrome Diopside set in resin and a separate Russian specimen report.
A green pyroxene with its own identity
Chrome Diopside is a chromium-bearing variety of diopside, a calcium-magnesium silicate in the pyroxene family. Its chemistry and crystal structure differ from emerald, tourmaline and jade, even when their greens appear similar. Trace chromium can produce an intense green: GIA documented this mechanism in a diopside crystal enclosed within a diamond. Iron also influences diopside’s appearance, and a green color alone does not establish the proportions of its color-causing elements.
Crystal structure and geological setting
Diopside is monoclinic and can form prismatic crystals as well as granular or massive aggregates. The Handbook of Mineralogy describes it in several geological environments, including metamorphosed carbonate rocks, skarns and some igneous rocks. Its presence in a rock is therefore a mineralogical clue rather than a unique geographic signature. A locality should come from documented sourcing or appropriate analysis, rather than from green color.
Our resin piece
The March photograph shows green mineral fragments set within clear resin. It is a composite object: the transparent enclosing material is part of the finished piece and is not a continuous natural diopside crystal. This format lets the individual fragments remain visible from different angles. The resin also determines how the surface wears and how the object should be cleaned.
Our separately tested Russian material has its own Chrome Diopside (Russia) laboratory page. That report describes diopside with dolomite filling fractures, chromium present and iron as the main reported color contributor. Its findings concern that specimen and should not be transferred to the resin piece.
Handling and care
Diopside’s Mohs hardness is approximately 5.5–6.5. It is brittle and has distinct cleavage, so resistance to scratching and resistance to a sharp impact are different concerns. For the resin composite, use a soft slightly damp cloth and dry gently. Avoid abrasive polishing, solvents, hot water, steam and ultrasonic cleaning. Keep the surface away from harder jewelry and rough handling. These conservative care steps protect the enclosing material as well as the mineral fragments.
View this photograph in March 2025 Memory Lane →