Natural Raw Ethiopian Opal - Welo Rough Opal Stone with Blue & Green Fire

https://armoniagems.com/collections/raw-ethiopian-opal

The dominant blue fire in this raw opal stone is produced by smaller silica spheres within the stone's internal structure. In opal, different sphere sizes produce different colors — smaller spheres diffract blue and violet light, medium spheres produce green, and larger spheres create orange and red. The fact that this stone shows strong blue alongside green, orange, and red means it contains a remarkably diverse range of sphere sizes — creating the multicolor broadflash that makes this opal raw crystal inside so visually complex.

The crystal-transparent body — more see-through than a typical white or milky Welo opal — allows light to interact with these sphere layers from multiple depths simultaneously, creating the luminous, three-dimensional quality of color that distinguishes premium raw opal rock from ordinary specimens.