The most popular nail art rhinestones, flat back crystals are easy to apply on natural or artificial nails. High-quality shining glass craft: Nail crystal is made of high-quality glass, superb cutting technology, high transparency, color reflection, the gem surface is bright without scratches, very hard, and not easily broken. When the light shines on AB crystal, your nail crystal will be super shining, reflecting rainbow-like colors, making your charm dazzling.