THE MATERIAL LIBRARY
Lapis Lazuli
A blue rock containing lazurite with minerals such as calcite and pyrite.
Colors & patterns
Rich blue, sometimes with white calcite and metallic gold-colored pyrite flecks.
Typical origins
Afghanistan is a historic source; Chile and other regions also produce lapis.
Hardness
About 5–6, with variation across the rock
Choosing & setting this material
Natural flecks and veining are part of its character. Dye or wax treatments may occur; avoid solvents and harsh cleaning.
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