5.88 Ct. Cabochon Semi-Black Opal from Australia

This piece is a 5.88 carat, freeform Semi-Black Opal from Australia, measured at 20.05 x 13.89 x 3.89 mm, exhibiting an opaque body with an overall intense color intensity, and an excellent polish. The freeform shaping indicates that the cutter retained maximum weight and natural color pattern rather than imposing strict geometry, resulting in an organic outline that follows the most desirable color-bearing zones. The cut is recorded as n a, reflecting the absence of standard faceting and confirming a cabochon style concept executed as a low domed, polished surface, engineered to enhance play of color across variable viewing angles. No enhancements have been applied to this specimen, confirming it as a natural, solid opal, and the origin of Australia supports typical microstructure and body tone characteristics associated with quality semi black material.

Optically the stone displays broad flash and patch patterns, with dominant electric blues and vibrant greens, complemented by secondary orange and violet accents that activate under movement, consistent with well-ordered silica sphere diffraction in higher density regions. Color grade is best described as intense, with saturation and chroma sufficient to produce strong face up presence even within a semi black body tone, the latter contributing to contrast without the deep absorption of true black material. The polish quality is excellent, minimizing surface scattering and preserving crisp color boundaries between patches, which indicates careful lapidary work with progressive grit sequences and final cerium or diamond paste finishing. For setting, the freeform outline and relatively low profile depth favor custom bezel or low prong mounts that secure the perimeter while exposing maximal color area, and the weight to size ratio supports use as a focal gem in bespoke rings, pendants, or artisan inlays. The Natural Gemstone Company certifies the described attributes and can provide additional imaging under varied lighting to demonstrate color play, along with recommendations for protective settings and routine care to avoid desiccation and abrasions. This specimen will appeal to connoisseurs who prioritize natural, unenhanced semi black opal specimens with pronounced play of color and expert polishing.