1.13 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent 1.13 carat round blue sapphire presents precise proportions, with dimensions of 5.60 x 5.64 x 4.22 mm, and a faceted finish executed in a mixed brilliant cut, a choice that balances optimal face up color with lively return of light. The mixed brilliant design pairs a well proportioned crown featuring a large table and a series of star, bezel, and upper girdle facets, with a pavilion engineered to channel light back through the crown, yielding scintillation without excess darkening. The cutting emphasizes a measured table size and crown angle to protect depth of tone, while the pavilion facet architecture approximates a 57 facet round brilliant geometry, tuned to the sapphire material to avoid windowing and to preserve its intense color intensity. Clarity is graded slightly included at eye level, a grade that indicates the presence of minor internal features, typically fine silk or minute crystals, which are positioned and managed during cutting to minimize visibility and to sometimes enhance the appearance of color by scattering light within the stone. The polish is excellent, indicating tight facet junctions and a smooth facet surface that maximizes luster and light return, qualities that are evident when the stone is examined under 10 times magnification or viewed mounted, and these finishing standards reflect the quality control applied by The Natural Sapphire Company.

The story of this sapphire begins deep in Sri Lanka, formerly referred to as Ceylon, where geological processes active millions of years ago created the conditions for corundum to form. In aluminum rich and silica poor crystalline host rocks, under conditions of high temperature and pressure during regional metamorphism, aluminum oxide crystallized into corundum, an inherently hard and stable mineral, while trace levels of iron and titanium became incorporated into the crystal lattice. The blue hue of this sapphire originates from intervalence charge transfer between iron and titanium centers, a mechanism that produces a vivid blue that responds strongly to directional light. Over geological time scales, tectonic uplift and weathering liberated these corundum crystals from primary bedrock into secondary alluvial gravels, where hydraulic sorting concentrated gemstones in river channels and ancient stream beds, a provenance pathway characteristic of many Ceylon sapphires. Subsequent human intervention in the form of careful heat treatment, a traditional and widely accepted enhancement, was applied to this sapphire to remove residual silk and to stabilize and intensify the blue by altering internal microstructures, a controlled process that improves transparency and color uniformity without altering the fundamental origin or identity of the stone.

From a cutting and setting perspective, this gem is calibrated to perform in precision jewelry applications, particularly in solitaire rings, three stone settings, and bespoke designs where a strong face up color and measured brilliance are desired. The mixed brilliant cut allows the cutter to distribute pavilion depth so that the 4.22 mm girdle to culet dimension supports robust light dispersion, while maintaining durable girdle thickness and minimizing susceptibility to chipping during mounting. Slight inclusions evaluated at eye level have been strategically positioned near facet junctions or toward the pavilion to reduce their visibility to the unaided eye, and the excellent polish ensures that surface reflections remain crisp rather than hazy. For mounting, recommended options include low profile bezels and four or six prong settings that secure the girdle while allowing table illumination, a design approach that harmonizes protection with optimal color display. The provenance, heat treatment disclosure, and gemological assessment presented here are provided by The Natural Sapphire Company, whose lapidary and gemological teams document origin and enhancement status to ensure buyer confidence and long term value. This Ceylon blue sapphire therefore combines an intelligible geological lineage, technical cutting refinement, and practical design readiness, offering a stone that appeals to connoisseurs who value precise gem metrics, natural history, and transparent disclosure.