Method to assess magnetism of a gem, direct method with strong magnet (Neodyme) or boat method gem floating on a boat
Mendeleev table showing elements inducing magnetism, Mn, Fe, Ni and rare earth
Garnets, peridos, start diopside, green tourmaline, magnetite, rhodonite, rhodochrosite, synthetic pink zirconium  synthetic diamonds
magnetism and refractive index in garnets, grossular, demantoids, ugrandites series and pyralpites series
Chelsea

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Dichroscope
Polariscope
 Magnestism
Conoscope
Magnetism
Refractometer
 UV

and the video here:

Other tools
Lab tools

Magnetic rocks

Some magnetic gems

magnetism and refractive index in garnets

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Method to assess magnetism of a gem