Emerald Dioptase Pigment

Description

Emerald Dioptase is a rare and intensely colored natural mineral pigment derived from the copper silicate mineral dioptase. When ground, it produces a vivid emerald green of exceptional brilliance, often described as richer and more luminous than malachite or chrysocolla. Its crystalline structure imparts a natural sparkle and depth to the pigment, making it highly prized for specialty and historical palettes.

In use, dioptase pigment is semi-transparent with strong granulation, yielding glowing, jewel-like greens in watercolor and tempera. In oils and acrylics, it retains its vibrancy but requires careful handling, as the pigment is somewhat brittle compared to other copper-based minerals.

History

Dioptase has been admired since antiquity, though its relative softness made it more common as a gemstone and ornamental mineral than as a widespread pigment. Its name derives from the Greek dia (through) and optos (visible), referring to its strikingly transparent emerald-green crystals. In the pictured artwork of the Nahal Hemar Cave object, Dioptase is used in the verdant green streaks over the crown of the mask.

Though not as common in traditional European palettes as malachite or verdigris, dioptase was sometimes ground into pigment in Central Asia and collected by mineral enthusiasts in Europe from the 18th century onward. Its rarity and intense color made it a luxury material rather than a staple pigment.

Today, Emerald Dioptase pigment is produced mainly for historical reconstructions, artisan paintmaking, and collectors who value its rare beauty and authenticity.

Pigment Information

Pigment Type: Natural Mineral (Copper Silicate)

Chemical Composition: CuSiO₃·H₂O

Suitable Mediums: Watercolor, Oil, Tempera, Acrylic, Encaustic, Cold Wax, Casein, Milk, Swedish Flour, Lime / Fresco

Lightfastness: Excellent

Opacity: Semi-Transparent

Other Names: Copper Emerald, Copper Silicate Green, Emerald Dioptase

Color Index Code: N/A

Pictured Artwork: Nahal Hemar Cave object