Rare Vivid Green colourful Opal 18.75 (ct) Black Opal Top Quality Rough - Height: 23 mm - Width: 19 mm- 3.75 g - (1)

Black opal is one of the most highly prized opal varieties, distinguished by its dark body tone which provides a striking contrast to vibrant play-of-color patterns. This rare vivid green opal specimen, weighing around 18.75 carats, showcases intense coloration that is especially valued in gem and mineral collections.

Opals are formed from hydrated silica deposited in cracks and cavities in rocks, often in sedimentary environments. Their unique internal structure diffracts light, creating the characteristic iridescence. Black opal is primarily sourced from regions like Lightning Ridge in Australia but rare examples can be found elsewhere.

Rough opal specimens retain natural textures and shapes, appealing to jewelers seeking to create unique pieces and to collectors who appreciate natural crystal specimens. The bright green hues in this opal highlight its exceptional quality and aesthetic appeal.