Flat back studs and labret piercing jewelry are popular choices for various types of piercings, including lip piercings, ear piercings, and nose piercings. Flat back studs are designed with a flat disc or plate on one end of the jewelry. This flat back sits flush against the skin, providing comfort and stability. Gemstones like diamonds, cubic zirconia, opals, or colored crystals can add sparkle and enhance the aesthetic appeal of the jewelry.