Jewelry consists of ornamental type objects which are worn by people as a style, or fashion, typically made with gems and precious metals. Costume jewellery is made from less valuable materials. However, jewellery can and has been made out of almost every kind of material. So the description cannot be based on the materials used in jewelry. The word jewelry is derived from the word "jewel", which we use to describe a precious stone, and once we're wearing it, it becomes jewelry.
Some cultures have a practice of keeping large amounts of wealth stored in the form of jewellery. Jewellery can also be symbolic, as in the case of Christians wearing a crucifix in the form of jewellery, or, as is the case in many Western cultures, married people wearing a wedding ring. Jewellery in various forms has been made and worn by both fun es in almost every (if not every) human culture, on every inhabited continent. Although we seem to wear it based more upon how it makes us look.
Jewellery, particularly when made with precious materials, is generally considered valuable and desirable. A variety of precious gemstones, coins or other precious items can be used, often set into precious metals. Common metals used for jewellery include gold, platinum or silver. Most gold alloys used in jewellery range from 10K to 21K gold, while platinum alloys range from 900 (90% pure) to 950 (95.0% pure). The silver used in jewellery is often sterling silver.