2.47 Ct. Bluish Grey Star Sapphire from Ceylon (Sri Lanka)

This translucent 2.47 carat oval bluish grey star sapphire presents as a textbook example of Ceylon corundum, with dimensions of 7.56 by 6.29 by 5.39 mm, cut as a high dome cabochon to optimize asterism and light return. The overall tone is light with a subtle bluish grey hue, and clarity is graded very slightly included at eye level, a grade that balances transparency with the internal rutile silk necessary to form a crisp star. The polish is excellent, producing a smooth, satiny surface that supports strong surface reflection while avoiding any disruption to the underlying star. No enhancements have been applied, the stone is natural and untreated, and the origin is Ceylon Sri Lanka, a proven source for classic star sapphires with well developed silk networks. The combination of the generous dome height of 5.39 mm relative to the average diameter and careful axial symmetry in the cabochon shaping concentrates and sharpens the asterism, while the oval outline measures 7.56 mm along the long axis and 6.29 mm along the short axis, dimensions that translate to an elegant appearance when mounted for wear.

Asterism in this specimen is a clear six ray star produced by three intersecting orientations of rutile needle inclusions aligned with crystallographic directions in the corundum lattice, the intersecting silk networks scattering light to produce the star like rays. The star is well centered on the dome, each ray defined with good contrast against the body color, and the rays extend to approximately two thirds of the cabochon radius under directional illumination, creating a proportional star that reads well at typical viewing distances. Due to the stone translucency the star displays mobile behavior, shifting gently across the dome as the light source or the wearers hand moves, and under a single overhead point light the central crossing is tight and defined, indicating a coherent and dense rutile orientation. The light color intensity allows the star to remain visible without the body color overwhelming the asterism, and the fine polish permits crisp ray edges rather than diffuse fuzzy bands, a characteristic that separates commercially robust stars from museum quality specimens.

From a practical gemological and jewellery engineering perspective this 2.47 carat oval cabochon combines aesthetic performance with daily wear suitability, making it a strong choice for an engagement setting that emphasizes uniqueness and durability. Corundum hardness of 9 on the Mohs scale ensures scratch resistance superior to most gemstones, and the cabochon format mitigates the risk of facet chips while the robust dome offers protection for the star plane. For ring deployment we recommend secure bezel or partial bezel settings that cradle the stone and preserve the face up presentation, while allowing sufficient exposure to directional light so the star remains animated in ordinary environments. The oval silhouette harmonizes with both solitaire and halo architectures, and the given dimensions will sit comfortably on common ring heads designed for stones in the 2 to 3 carat range, providing a commanding presence without overwhelming typical finger proportions. Considerations for prong placement should prioritize containment of the girdle without impinging the dome, and for bespoke commissions micro profile engineering can be used to tilt the stone slightly to maximize star visibility when the hand is at rest.

Provenance and finishing details further enhance the value proposition for this gem as an engagement stone, The Natural Sapphire Company offers full disclosure of origin and treatment status, and this unenhanced Ceylon star sapphire exemplifies the silk structure and cutcraft associated with fine Sri Lankan material. The cabochon was shaped with attention to dome curvature uniformity and axial alignment, procedures that are essential to yielding a centered star and minimal deviation in ray symmetry, and the excellent polish is the result of controlled lap speeds and progressive abrasives chosen to maintain the integrity of the silica rich surface without introducing polish pits or heat affected zones. For buyers who prioritize natural optical phenomena and long term performance the stone represents a rare convergence of crisp asterism, classic Ceylon color signature, and practical dimensions. If you would like technical documentation photographs or mounting recommendations from The Natural Sapphire Company design team we can provide high resolution images under standardized light sources, mounting mockups, and bespoke setting proposals to ensure the star sapphire performs optimally as a signature engagement gem.