THE MATERIAL LIBRARY
Shell
An organic material cut from mollusk shells, often showing nacre.
Colors & patterns
White, cream and iridescent pink, green or blue tones.
Typical origins
Origin depends on species and where the shell was harvested or farmed.
Hardness
Variable; generally soft
Choosing & setting this material
The illustration shows an abalone-like nacre example. Confirm species, treatment and whether the piece has a backing; thin shell needs a supportive setting.
Care & cleaning
Wipe gently with a soft, slightly damp cloth and dry promptly. Avoid soaking, acids, solvents, steam and ultrasonic cleaning. Store separately to protect the surface.
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