Goldstone
Man-made glass containing metallic copper inclusions · Decorative Stone / Synthetic Gemstone
Crystal System
Amorphous (Man-made glass)
Mineral Group
Silicate glass
Chemical Formula
SiO2 with Cu inclusions
Formation Process
Human-made through the melting of silica, copper oxide, and other metal oxides in a reducing atmosphere
About This Crystal
A tumbled, polished smooth stone with an opaque dark brown or reddish-brown body densely filled with glittering, reflective metallic copper crystals that give it a spangled, star-like appearance.
Physical Characteristics
Dark reddish-brown to black body color with bright golden-copper metallic glitter; white streak; no cleavage; conchoidal fracture; specific gravity around 2.5; brittle tenacity.
Optical Properties
Singly refractive amorphous glass with strong metallic aventurescence caused by suspended copper crystals.
Hardness & Durability
Origin Region
Synthesized globally, historically invented in Venice, Italy
Hardness & Durability
Mohs hardness of 5.5 to 6; moderate toughness but can chip or scratch easily; sensitive to harsh chemicals and thermal shock.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners, steam cleaners, and harsh chemical abrasives; store separately from harder gems.
Rarity & Value
Common; widely available and very affordable, typically sold as polished tumbled stones, beads, and carved jewelry.
Special Characteristics
Aventurescence, featuring a brilliant glitter effect produced by tiny reflective metallic copper platelets suspended within the glass matrix.
Lore & History
Invented in 17th-century Venice by the Miotti family through alchemical tradition. Often referred to as the stone of ambition, vitality, and confidence in modern crystal healing.