Swarovski's signature jewelry clay is Ceralun ceramic epoxy composite. Especially developed for use with crystals, this high-performance epoxy combines superior adhesion with maximum elasticity and optimal load transmission. It works perfectly for embedding crystals and other small baubles in your jewelry and craft designs. It works best on surfaces of glass, metal, gluable plastic, rubber, wood, cork, and porcelain. Choose from a variety of pretty colors to create the backdrop and foundation for your miniature mosaics and brilliant bling!