Australian Boulder Opal. 20.38 carats. Cabochon- 4.08 g - (1)

Australian Boulder Opal is a fascinating gemstone characterized by its vibrant play-of-color against a natural ironstone backing. Boulder opals are found primarily in Queensland, Australia, and feature vivid flashes of blue, green, red, and other colors, often embedded within the host rock matrix. Weighing around 20 carats, such cabochon stones exhibit unique color patterns that make each specimen distinct. The cabochon cut, a smooth rounded shape without facets, optimizes the visibility of the stone’s internal fire and iridescence. Boulder opals are prized by collectors and jewelers for their durability, colorful beauty, and distinct Australian origin. They represent an important segment of opal gemstones in the global market.