THE MATERIAL LIBRARY
Zoisite
A mineral with several gem varieties; green zoisite with ruby is often called ruby-in-zoisite or anyolite.
Colors & patterns
Green with black patches and red ruby areas in the illustrated variety.
Typical origins
Ruby-in-zoisite is associated with Tanzania; zoisite as a mineral occurs elsewhere too.
Hardness
About 6–7 for zoisite; composite material varies
Choosing & setting this material
This page illustrates ruby-in-zoisite, not blue tanzanite. Mixed minerals can polish differently, so examine fractures and protect the cab from impact.
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