man-made glass

Blue Goldstone

Man-made glass with cobalt and metal flecks

AI-generated identification · may be incorrect

Dark blue to nearly black base with bright, metallic, starry inclusions. Hardness is around 5.5 to 6 on the Mohs scale. Vitreous luster.

Identified July 24, 2026More man-made glass →

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Physical properties

Dark blue to nearly black base with bright, metallic, starry inclusions. Hardness is around 5.5 to 6 on the Mohs scale. Vitreous luster.

Formation & geological history

Goldstone is a type of glittering glass made in a low-oxygen reducing atmosphere. The original process was invented in Venice in the 17th century. Blue goldstone is created by substituting cobalt for copper.

Uses & applications

Used primarily in lapidary arts, carved figurines, cabochons, and inexpensive bead jewelry.

Geological facts

Despite often being sold alongside natural semi-precious stones, goldstone is entirely synthetic. It is sometimes called 'aventurine glass' due to its resemblance to the natural mineral aventurine.