As the name suggests, a bracelet is a piece of jewellery worn on the arm. Normally bracelets are worn above the wrist. When and where exactly the bracelet originated is not known in detail. However, it is known today that arm jewellery was already worn in the Palaeolithic Age. While animal teeth and amber as well as copper and bronze were used to make bracelets back then, today materials such as silver, gold and stainless steel, but also bracelets made of textile compositions and leather as well as pearls are popular. There are various fastening options for bracelets, some of which are also adjustable in size so that the bracelet can be adapted to the respective wrist. While many bracelets have a carabiner or spring ring as a clasp, there are also pull and magnetic as well as knotted clasps and elastic bracelets. With the latter, the band is virtually self-contained and so stretchy that it can be put on without a separate clasp by sliding it over the back of the hand. The decorative elements of a bracelet are as variable as the types of clasps. Besides diamonds or precious stones, a bracelet can also have pendants in different shapes and engravable elements. In addition to the purely decorative aspect, bracelets often also play a functional role. Wristwatches, for example, show the time, but bracelets are also often used as identification (in hospitals, among other places) or as access authorisation (festivals, hotel facilities, etc.). In addition, bracelets often serve as a token of friendship or love.