What is Dioptase?


Dioptase is a copper cyclosilicate mineral that is often found in Kazakhstan, Namibia, and the Democratic Republic of Congo. It’s primarily used as a gemstone and is popular for its deep green color.

Dioptase is a captivating gemstone that comes in shades of deep green. Its unique appearance and color make it a popular choice for jewelry and decorative items, especially beads and pendants.

Gemstone Properties

Chemical ClassificationInorganic - Silicate
ColorDeep green, often resembling emerald.
TransparencyTransparent to translucent.
OccurrenceNamibia, Kazakhstan, and the Democratic Republic of the Congo.
FormationTypically found in the oxidized zones of copper deposits, often in association with malachite.
Mohs Hardness5
Specific Gravity3.28 - 3.35
Diagnostic PropertiesIntense green, vitreous luster.
Chemical CompositionCuSiO3·H2O
PleochroismWeak; green to bluish green.
Crystal SystemHexagonal
Optical PropertiesBiaxial (+)
Refractive Index1.648 - 1.709
2V angleMeasured: 58°
DispersionNot typically noted for its dispersion.