If the vampire with this equipment is burned, draw the top vampire from your crypt. If that vampire is younger, put the Soul Gem on him or her and move him or her to your ready region with blood from the blood bank equal to his or her capacity; otherwise move that vampire to your uncontrolled region (and burn the Soul Gem). If bearer is diablerized, the diablerizing vampire cannot take the soul gem.
Clarifications and Rulings
Functions even if the bearer (now burned) was prohibited from using equipment (via Drawing Out the Beast, for example). [LSJ 20010729]
Functions even if the bearer is (was) an ally - the new vampire from the crypt is placed into the uncontrolled region (since he is not younger). [LSJ 20020315]