THE MATERIAL LIBRARY
Goldstone
Man-made glass containing reflective crystals; it is not a natural mined stone.
Colors & patterns
Commonly coppery reddish brown; blue and green versions also exist.
Typical origins
Manufactured in several countries, with a historic association with Venetian glassmaking.
Hardness
About 5–6
Choosing & setting this material
Tiny reflective particles give an even glitter. Do not confuse it with natural sunstone or aventurine quartz; describe it as a manufactured decorative material.
Care & cleaning
Clean gently with lukewarm water, a little mild soap and a soft cloth, then dry. Avoid steam, ultrasonic cleaners, harsh chemicals and sudden temperature changes, especially when treatments are unknown.
Origins above describe typical sources of the material, not the origin of an illustrated or stocked stone. Hardness measures scratch resistance, not resistance to breaking. Confirm the identity and treatments of the actual piece.
Further reading: Material reference · GIA: gem treatments