THE MATERIAL LIBRARY
Glass
A manufactured non-crystalline material used for decorative cabochons.
Colors & patterns
Nearly any color, transparent or opaque, with swirls, bubbles or decorative inclusions.
Typical origins
Made in workshops and factories worldwide; the maker determines the production origin.
Hardness
Varies with formulation
Choosing & setting this material
Glass can imitate natural gems or be valued as art glass in its own right. It can chip at edges; ask about coatings, foil backing or assembled construction.
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