Origin of magnetic response
Iron, manganese and other paramagnetic species can influence gemstone magnetic susceptibility. The response depends on composition and mineral structure.
Practical method
Use repeatable suspension or float methods, suitable strong magnets and consistent viewing conditions. Document movement rather than relying on impressions.
Combining observations
Magnetic behaviour may help narrow candidates, including certain garnets, but cannot alone distinguish all species or treatments.
Illustrated guide
Frequently asked questions
Does a gemstone need to contain visible iron to be magnetic?
No. The response can arise from ions present at concentrations too small to be visually obvious.