28.50 Ct. Grey Star Sapphire from Ceylon (Sri Lanka)

This 28.50 carat round grey star sapphire from Ceylon is presented in a classic cabochon form, with dimensions of 16.55 x 15.54 x 10.27 mm, a high domed profile that optimizes the appearance of asterism. The body color registers as medium intensity grey, with translucent bodytone that permits light transmission while preserving contrast for the star. Clarity is graded included at eye level, reflecting the presence of oriented rutile silk that is responsible for the sharp six rayed asterism under a single overhead light source. The cutting approach emphasizes axial symmetry and a well centered dome, so the three sets of parallel needle inclusions intersect at approximate 60 degree angles to produce a pronounced, movable star. The depth or height of the cabochon at 10.27 mm is proportioned deliberately to enhance the optical path length, enabling stronger light scattering within the silk and producing a crisp, concentrated star at typical viewing distances. This sapphire has not been subjected to any enhancement, and the surface exhibits an excellent polish that contributes to a smooth, satiny luster, while minimizing surface diffusion of light that could otherwise blur the star.

Craftsmanship specific to star sapphires is evident in the careful orientation of the preform during sawing and the incremental shaping on progressively finer abrasives, a workflow that preserves the integrity of the rutile silk and yields an even, stable asterism. The symmetry of the round outline, coupled with the uniformity of the dome, supports predictable star placement, which simplifies design decisions for setting. For mounting, a bezel or closed setting aligned so the crown faces the primary light source will maximize the visual impact of the star, and the substantial carat weight makes this gem suitable for a bold pendant or a statement ring, provided protective metalwork is used to safeguard the high dome. The Natural Sapphire Company stands behind the origin and untreated status of this Ceylon stone, and we detail its measured proportions and optical characteristics for discerning buyers who prioritize natural asterism, precise cutting, and documented provenance.