With Crushed Sea Shells get the best looking output from seashells with shimmering pearlescent! Crushed shells may include built into either gel or acrylic, used as nail art or made. As French border in your artificial nails. You have many options with crushed shells, you can for example. mix them in your gel or acrylic to achieve a brand new product.The crushed seashells can be used both to individual design as a French edge, but also be used with rhinestones, striping paints, striping tapes or some of the many other products B4Beauty offer.