The O-NUT cylindrical earring back is an innovative jewelry accessory for studding earrings, which puts a new spin on traditional ways of holding earrings securely in place. When used correctly, its design makes it safer to use, since it is less likely to slip off. This system uses pressure and the product’s tubular shape makes it easier to handle and to clean inside and outside. Its simple design is different from the traditional and “rococo” earring nuts. Easy to manufacture industrially in gold, silver or even steel, it is comfortable to wear and to store. O-NUT offers a solution that is both functional and esthetically pleasing.