Goldstone

Goldstone is a glass with flecks of copper suspended in it. The glass is made in a reducing furnace with copper salts added, which "smelts" the copper salts back to copper, which then crystallizes. The copper platelets suspended in the glass give Goldstone its characteristic glitter. Historically Goldstone has been around since the European Renaissance. Stories say that it was discovered by early Venetian monks working at a glass factory who practiced alchemy when by accident, molten copper tipped into a molten glass container. This crystallized into thousands of tiny crystals and formed a melt with golden light sparkles.