THE MATERIAL LIBRARY
Chrysoprase
Nickel-colored green chalcedony.
Colors & patterns
Apple green to deeper green, often translucent.
Typical origins
Australia is a notable source; deposits also occur in Brazil, Tanzania and elsewhere.
Hardness
6.5–7 on the Mohs scale.
Choosing & setting this material
An even dome emphasizes its luminous color. Dyed chalcedony can imitate it, so confirm identity. Avoid prolonged strong heat and sunlight.
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