Sometimes the pear can be pried loose by inserting a stiff pointed needle spring between the pearl and the outer edge. You need to be very careful not to damage the edge of the pearl holder using this method. The stubborn ones often require very carefully cutting down the center of the pearl with a thin diamond cutting wheel in a dremel tool. Once split in this fashion, the pearl is easy to pry out using a small screwdriver or knife blade. Both techniques require a steady hand and some degree of skill, so be very careful. If you are not sure of your ability, take the sax to an experienced tech to avoid damaging the keys.