The type of jewelry you see in the picture above can not only be worn in the nose but also many other body piercings. As long as the barbell's gauge matches that of your piercing hole, you can wear it in different parts of the body. This is possible because it's a seamless ring with a side opening, so it does not come with a closing mechanism. To open it up, twist the ends forward or backward. Avoid distorting it over time, as it would happen if you pull the ends apart sideways. The ring is made of brass and has different coatings: if you pick one of the silver color models, it's coated in platinum. However, the models in yellow and rose gold color are plated in 14-karat gold.
You have probably also noticed that there are several stones in the visible part of the ring, which covers the entire bottom semicircle. The half of the circle that will not remain inside your nose or ear is studded with many tiny stones. You can choose the zirconia stone color you like, such as turquoise or pink. However, both in the yellow gold and rose gold models, the stones will always come in clear color, which will make these combinations look amazing.