Resination refers to a process whereby a plastic resin (typically a polyester) is vaccuumed THROUGH the stone inorder to enhance the stone's flexibility (reducing its natural brittleness) inorder to make improve its transportability.  You may have noticed a sharp increase in the number of stones that have come to market over the past few years.  The resination process is credited for this developing, allowing many stones that did not travel well to be shipped around the world.