The best rhinestones craft supplies utilize iron or intensity them. Most Rhinestones are glass rhinestones flatback in the round, little-measured shapes. Because of the restricted intensity obstruction of the acrylic and gum rhinestones, they are difficult to work with. There are not really rhinestones in plastic material. They are for the most part level back and with openings on the sides or in the center. Subsequently, they can be sewn on without any problem.