Koroit Nut Boulder Opal // 79 Carats

This highly reflective Koroit nut boulder opal from Queensland, Australia, is a breathtaking AAA specimen of one of the world’s most coveted opals. Second only to black opal in rarity, boulder opal is prized for its vibrant play of color, and this piece is no exception. Its rich brown ironstone matrix is densely laced with brilliant veins of electric green, blue, purple, and orange, creating a glittering, almost infused appearance. A mesmerizing and dimensional piece, this opal is a true collector’s treasure. Explore its striking beauty in our gallery.
Interesting Facts
Boulder opals are unique among opals because they form within ironstone, creating an incredible contrast between the host rock and the vivid opal veins. The Koroit opal field in Queensland is famous for producing some of the most striking and richly patterned boulder opals in the world. The vibrant colors seen in opals result from microscopic silica spheres that diffract light, producing an unparalleled spectral display.
Features
Origin: Koroit Opal Field, Queensland, Australia
Material: Boulder Opal in Ironstone Matrix
Condition: Natural, highly reflective AAA specimen
Special Characteristics: Densely patterned with vibrant opal veins in electric hues
Dimensions and Weight
Height        Length        Depth        Weight
1.75"        0.75"        0.38"        79 ct
Just in Astro West.