Swarovski Elements Sew On Stones are loose crystal elements that can be sewn by hand or machine onto any type of textile or accessories. Sew On Stones come in one, two or three hole varieties and cane used for a range of decorative purposes of for fine embroidery. 3251 Space Cut Sew-on Stones Swarovski Elements is available in sizes: 18x9mm and 30x15mm.