Opal is a unique and colorful gemstone known for its vibrant play of colors, which is caused by the way light interacts with its internal structure. It is primarily composed of silica and water, making it a mineraloid rather than a true mineral. Opals can be found in various types, including precious opal, which displays a brilliant array of colors, and common opal, which is more subdued. This gemstone is often used in jewelry, such as rings and necklaces, due to its striking appearance. Australia is the largest producer of opals, particularly famous for its high-quality precious opals. Opals are also believed to have various metaphysical properties, including enhancing creativity and emotional balance.