Serinity sew on crystals Galactic (3256) in Jet UNFOILED are loose flat backed crystals that come with a thread hole, enabling the crystals to be sewn onto fabric. Serinity Galactic sew-on boasts a cosmic-inspired shape with impeccable faceting that results in a striking play of light. This crystal is perfect for modern and bold designs due to its edgy appearance. The sew-on crystal comes with two holes at the top and bottom, enabling it to be incorporated into a range of embellishment designs.