4.00 carats Natural Australian Black Opal | Freeform – 8 × 20 × 5mmA striking Australian black opal displaying vivid blue green flashes across a deep body tone. The contrast between dark base color and electric play of color creates strong visual intensity. The elongated freeform shape allows the color bands to stretch naturally across the surface, producing movement under shifting light. The polish supports a smooth dome that enhances its optical depth. With its slender proportions and dynamic color, this gemstone