Piece of distilled Thulium. Tm is paramagnetic!

 
Cr,Tm,Ho:YAG (CTH:YAG). Yttrium aluminium garnet laser rod doped by Cromium, Holmium and Thulium (ca 4%). On the second photo, luminescense of Cr centers induced by 405 nm laser diode.

 
Metall-halide lamps containing Thulium Iodide (TmI₃). Philips MHN-T and Philips MHN-TD.