Goldstone

Goldstone is a type of glittering glass made in a low-oxygen environment. The most common variety is a reddish-brown color with tiny, sparkling crystals of metallic copper. It is typically made by melting silica, copper oxide, and other metal oxides together, then cooling the mixture slowly. The copper crystallizes out of the melt, forming the glittery effect. Goldstone is not a naturally occurring mineral; it is entirely man-made. It is often used in jewelry and ornamental objects.