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

This translucent bluish grey star sapphire weighs 7.88 carats and is fashioned as an oval cabochon with dimensions of 10.78 x 10.10 x 6.32 mm. The proportions yield a length to width ratio of approximately 1.07, producing a gently rounded oval silhouette that balances surface area with depth to enhance both color and asterism. The cutting style is a classic domed cabochon, with a well centered dome that emphasizes the stone s optical phenomena while maintaining a stable pavilion thickness for secure setting. The color grade is medium intensity bluish grey, and translucency permits a well defined central star to be visible under direct light, while preserving an attractive body color that responds uniformly across the dome. Clarity is graded slightly included, evaluated at eye level, with internal silk and minor mineral inclusions that contribute to the formation and character of the star rather than detracting from appearance. The polish is excellent, presenting a smooth reflective surface that allows the star to glide cleanly across the dome without disruption from lap marks or surface pitting. There has been no enhancement, the material is natural as mined, which is an important factor for connoisseurs who value untreated gem material.

The optical display of this star sapphire derives from oriented rutile silk inclusions that intersect in three roughly equidistant directions within the corundum structure, producing a six ray asterism when the cabochon is cut with its c axis perpendicular to the base. The cutter oriented the preform to align the dominant rutile planes with the domed roof, a technical decision that concentrates light into a single, centrally positioned star. The resulting star is relatively sharp with well defined rays, and it shows good mobility when the stone or the light source is moved, indicating consistent needle orientation and uniform internal texture. The medium color intensity and translucency act together to provide contrast between the star and the body color, so the asterism reads clearly without the body appearing washed out or overly dark. From a lapidary perspective the execution demonstrates controlled material removal during preform shaping, progressive grit transition to fine diamond polishing compounds, and final buffing aimed at achieving an even sheen, all of which preserve the micrometric alignment of rutile while eliminating surface anomalies. These technical choices are critical in star sapphires, where dome geometry, symmetry, and polish quality determine how crisply the asterism displays.

Provenance from Ceylon Sri Lanka materially enhances the gem s desirability and market value, because Sri Lankan star sapphires have a long documented history for producing material with fine silk distribution and classic blue to bluish grey tonalities that appeal to both collectors and designers. Geologically, Sri Lankan corundum frequently forms in metamorphic environments that favor the inclusion of fine rutile needles rather than coarse needles or platelets, and that microstructure creates the conditions necessary for clean asterism when accurately oriented by the cutter. The absence of heat or diffusion treatment in this piece further elevates its standing, since natural Ceylon material with visible asterism and no enhancement commands a premium among specialists. For setting and design, the gem s near circular oval footprint and stable thickness support a variety of mounting options, with a high bezel recommended when long term wear is expected to protect the dome and preserve polish, while an open sided bezel or low crown setting can be used to orient the star so that it faces the wearer under normal lighting. The Natural Sapphire Company presents this specimen as a technically well executed, naturally occurring star sapphire with verifiable Sri Lankan origin, a documentation of its physical parameters, and the kind of material integrity that experienced buyers seek when acquiring asteriated corundum for investment, museum quality jewelry, or bespoke design projects.