Australian Opal is a unique gemstone known for its vibrant play of colors, which can include shades of red, blue, green, and yellow. It is primarily found in Australia, where about 95% of the world's opal supply is sourced. The stone forms in sedimentary rocks and is created from silica gel that hardens over time. There are several types of opal, including white opal, black opal, and boulder opal, each with distinct characteristics. Black opal is particularly prized for its dark body tone, which enhances the brightness of its colors. Opals are often used in jewelry, making them a popular choice for rings, necklaces, and earrings.