Dioptase is a relatively rare emerald-green mineral, sometimes tinged bluish or blackish. Crystals are small with a vitreous luster, and is transparent to translucent. Its green is very strong and bright even when compared to the more subtle green of emerald.

It forms green to blue-green encrustations and fillings of enamel-like or earthy texture. It is uncommon, and found in the weathered zones of copper sulfide deposits, where copper veins have been altered by oxidation, and in hollows and cavities in the surrounding rocks.

Dioptase has been used historically for it's psychotherapeutic properties. In general the Crystal is used to heal love sickness and allow persons to forgive.