1.03 Ct. Greenish Blue Sapphire from Nigeria

This transparent 1.03 carat asscher octagon shape greenish blue sapphire measures 5.13 x 4.63 x 4.30 mm, and presents a classical asscher faceting plan with concentric step facets that create a controlled interplay of light and color. The asscher cut emphasizes symmetry and proportion, featuring a relatively high crown, a small to medium table, and broad, parallel pavilion and crown steps that produce crisp flashes rather than dispersed brilliance. The cutter has preserved excellent polish across facet junctions, ensuring clean light return and crisp facet outlines. Clarity is graded as very slightly included when evaluated at eye level, meaning inclusions are minor, located in less conspicuous facet intersections, and do not detract from the overall transparency or light performance. Color is intense in saturation, a greenish blue hue with even tone across the pavilion that responds to light with subtle internal depth. The combination of an asscher step architecture and this intense, slightly greenish blue hue yields a sophisticated, deep windowing effect that favors color saturation over scintillation. This sapphire is untreated, no enhancement, and its natural coloration and internal character are intact, offering collectors an example of unaltered Nigerian material with precise cutting and exceptional polish.

The geological history of this stone began millions of years ago deep within the continental crust, where prolonged tectonothermal events subjected aluminum rich protoliths to elevated pressure and temperature, facilitating the nucleation of corundum crystals in metamorphic host rocks and in associated magmatic plumbing. Trace concentrations of iron and titanium became incorporated into the corundum lattice during growth, controlling the greenish blue hue through selective absorption mechanisms at the atomic scale. Over geological time, tectonic uplift and erosion liberated these corundum crystals, and secondary transport processes concentrated gem quality fragments in placers and residual deposits. The cutter selected this particular crystal for an asscher octagon outline to best express its natural color zoning and to maximize weight retention while achieving balanced proportions. The result is a precision faceted gemstone that communicates both its deep time origin and contemporary craftsmanship. The Natural Sapphire Company presents this sapphire with full disclosure of origin, treatment status, and measured parameters, allowing technically minded buyers to assess its material properties and provenance with confidence.