- Color: green, yellow-green, brown, blue, colorless
- Hardness: 5.5 - 6
- Refractive index: 1.66 - 1.71
- Density: 3.25 - 3.55
- Chemical composition: CaMg(Si2O6)
- Crystal structure: monoclinic
- Origins: USA, Brazyl, Austria, Italy, Tanzania, Pakistan, Russia, Sri Lanka, Burma.
Collector's gemstone. The best stones come from Russia and have a rich green color (chrome diopside). Clean pieces over 5 ct. are rare. Stones are generally not treated.