This certified natural boulder opal is offered with full third-party documentation from Gem Report Antwerp, providing professional gemological verification and clear confirmation of identity, origin, and optical characteristics. Officially identified as Natural Opal – Boulder Opal, this striking gemstone is documented under Gemological Report Number 1830015146 AN, dated 24 November 2025, and is accompanied by its original laboratory certificate, ensuring traceability and confidence for collectors, designers, and serious gemstone buyers. The opal is fashioned in an oval cabochon cut, a classic style that allows the natural play of color to remain uninterrupted and visually dominant across the surface. The stone measures approximately 15.82 × 4.86 × 2.49 mm and weighs 1.72 carats, offering an elongated, elegant profile well suited for statement jewelry designs. The cabochon finish enhances the organic character of the opal and highlights the internal color movement that boulder opals are prized for. Transparency is described as opaque, consistent with genuine boulder opal material where precious opal forms naturally within ironstone matrix. Color is noted as brown to deep brown with play of colors, and visually the stone displays a vivid iridescent play-of-color ranging from green to blue, as confirmed in the comments section of the report. Under changing light and viewing angles, flashes of electric green and rich blue shimmer across the surface, creating a dynamic and highly collectible visual effect that defines quality boulder opal. The report lists suggested origin: Afghanistan, a locality increasingly recognized for producing distinctive boulder opals with bold color contrasts and strong iridescence. Natural ironstone host material is visible, grounding the gemstone in its geological context and reinforcing its natural formation. The combination of earthy brown matrix and luminous green-to-blue color play creates a dramatic contrast that is especially desirable among opal enthusiasts. This Gem Report Antwerp certified boulder opal is ideal for custom rings, pendants, artistic jewelry designs, or collection as a certified loose gemstone. Its elongated oval shape lends itself well to modern and organic jewelry styles, while the documented play-of-color and origin add meaningful value and authenticity. Offered with original laboratory documentation and professional grading, this opal represents a compelling combination of natural origin, verified boulder opal structure, vivid green-to-blue iridescence, and trusted Gem Report Antwerp certification. It is an excellent opportunity to acquire a distinctive, character-rich opal with strong visual presence and lasting appeal within the colored gemstone market.