4" Sage bundle
 
Take the lighter and light the tip of the smudge bundle of your choice. Let it burn for 30 seconds, then blow out the flame so that the tips of the leaves are smoldering and releasing smoke. With your hand or a feather, spread the smoke around the crystal so that all parts of it have contact with a smokey current of air. Do this until the smoldering goes out and the smoke stops, or extinguish the burning sage in a bed of sand.  (You can use an abalone shell or heat proof vessel with sand to extinguish the sage.)
 
Be careful not to breathe in the smoke directly, and not to fill the area too thickly with smoke. Open up some windows or doors to keep air flow. Also, be mindful that too much concentrated smoke in a smaller room can cause your smoke alarm to go off.