This labret has a round cubic zirconia stone set into a 14-carat gold base. The prong setting ensures plenty of light hits the stone, so it sparkles beautifully. There are four stone sizes available: 1.5 mm, 2 mm, 1.5 mm and 3 mm. The stud fits into a bio-plast labret bar. Bio-plast is a bio-compatible plastic, perfect for people with metal allergies. Additionally, it is slightly flexible, which makes it very comfortable to wear. Although people typically wear labrets in lip piercings, they also look great in other piercings. These labrets are 16 gauge/ 1.2 mm thick, so they will also fit ear cartilage piercings. Such as tragus, flat and helix. Another advantage of bio-plast is that you can cut it to any size. So you can make it fit perfectly.