Place a handful of sphagnum moss in an orchid pot. Moisten it well. It should not be soggy.
Separate a stem from a healthy jewel orchid. Pull it gently away from the rest of the plant, untangling the roots. Cut the stem into pieces. Each piece should have two leaf nodes on it. Dip the cut ends of the stems in orchid rooting powder.
Place each stem piece in the sphagnum moss. Keep the moss moist, but not wet. Roots will develop from each section of jewel orchid stem. It will take several weeks, so be patient. Jewel orchids grow very slowly.
Pot each root in orchid potting media in a separate orchid pot when the roots are an inch or two long.