A fabulous opal ring can come in a range of varieties. There are black opals that are the most rare and valuable. Boulder opals occur as thin veins of precious opal in the cracks and cavities of light and dark brown ironstone. Light opal has a full range of colors and flashes. Doublet and triplet opals are assembled from 2 or 3 gemstones to create one piece of jewelry. There are also synthetic opals, which are produced in laboratories and have a similar structure to that of precious opal. Shop and choose a flattering opal ring from our abundant selection.