Coloured stones, often referred to as gemstones, are naturally occurring minerals that are prized for their beauty and rarity. They come in various colors, shapes, and sizes, and are commonly used in jewelry and decorative items. Some popular examples include sapphires, emeralds, and rubies, each valued for their unique hues and qualities. The color of a gemstone is influenced by its chemical composition and the presence of trace elements. For instance, diamonds can appear in a range of colors, including yellow, blue, and pink, depending on the impurities present. These stones are often cut and polished to enhance their appearance and are sought after for both aesthetic and investment purposes.