1.30 Ct. Spinel from Ceylon (Sri Lanka)

This gemstone is a transparent, round shape blue spinel, weighing 1.30 carat, with exact dimensions of 6.49 x 6.49 x 4.41 mm. The piece is fashioned in a mixed brilliant cut that combines brilliant-style crown faceting with a more restrained pavilion architecture to harmonize light return and color saturation. The clarity is described as very very slightly included evaluated at eye level, indicating that inclusions are minimal when the stone is viewed face up without magnification, and that the material presents a clean window to the observer. Color is classified as medium intensity blue, a balanced saturation that reads vivid in direct light while preserving depth in lower light. Polish is excellent, with mirror like facet surfaces and crisp junctions, and the gemstone has received no enhancement. Origin is Ceylon Sri Lanka, and this natural provenance is a key factor in its character. These technical specifications summarize the objective attributes that experienced buyers and gem cutters use to assess optical and market potential.

The geological narrative of this spinel begins millions of years ago in a high temperature, low silica, carbonate rich environment within Sri Lanka. Spinel commonly crystallizes in metamorphosed limestones that experienced contact metamorphism and regional recrystallization. Under elevated temperatures and pressures, aluminum and magnesium bearing minerals reacted with local fluid phases, yielding discrete octahedral spinel crystals within a marble matrix. Trace quantities of iron substituted into the spinel lattice during crystal growth, producing the blue coloration by selective absorption in the visible spectrum. Over geological time, tectonic uplift and surface weathering liberated these resilient crystals from their host rock. Fluvial processes concentrated them in alluvial gravels, where periodic transport and abrasion rounded crystal terminations and produced nodules suitable for recovery. The specimen offered here carries the geological memory of that entire sequence, from high grade metamorphic nucleation through mechanical concentration in Sri Lankan gravels, which contributes to the transparent, well formed material seen in the finished gem.

The cutter of this stone adopted a mixed brilliant strategy to maximize the optical properties inherent in the rough while conserving carat weight. The finished depth of 4.41 mm relative to the 6.49 mm diameter yields a depth proportion of approximately 68 percent, a deliberate choice to enhance face up color intensity and reduce windowing that would otherwise render a medium colored spinel pale. Crown facet design was arranged to provide strong scintillation and broad flash, while pavilion facet geometry was tuned to return light in a way that strengthens blue saturation without creating dead zones. Facet junctions are precise and symmetry is tight, which together with the excellent polish contributes to lively dispersion and controlled contrast patterns. The very very slightly included clarity grade evaluated at eye level means the stone presents a clean appearance in typical jewelry settings, and under loupe or microscope the inclusions are minimal and do not compromise durability.

For connoisseurs and designers who demand provenance and uncompromised material quality, this 1.30 carat Ceylon blue spinel from The Natural Gemstone Company represents a considered blend of geological authenticity and lapidary expertise. Its natural, untreated color provides assurance that the medium blue saturation is intrinsic to the crystal chemistry and growth environment, a feature prized by collectors. The mixed brilliant cut and deliberate proportioning make the stone adaptable for a variety of mounting styles, from solitaire rings that emphasize color depth, to halo settings that amplify apparent size and brilliance. Technical buyers will appreciate the quantifiable attributes, including exact dimensions, weight, cut type, eye level clarity, and the absence of enhancement, while designers will value the optical decisions made by the cutter to preserve both face up color and scintillation. The Natural Gemstone Company stands behind the documented origin and treatment status of this spinel, and we welcome specialist inquiries about facet diagrams, inclusion photography, and setting recommendations tailored to this stone.