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

This listing describes a single, translucent grey star sapphire weighing 0.73 carat, sourced from Ceylon Sri Lanka, offered by The Natural Sapphire Company. The stone is fashioned into an oval outline, with precise measurements of 4.98 by 4.42 by 3.60 millimeters, and it displays a light color intensity with subtle grey tones and faint blue undertones in certain light directions. The cabochon cut has been executed to emphasize the asterism, producing a visible star that appears under direct light, and the overall finish has been graded as excellent polish. The gemstone is natural with no enhancement, and the clarity has been evaluated as slightly included at eye level, which is consistent with material that exhibits asterism as a result of oriented inclusions.

The cabochon geometry and proportions have been selected to optimize the star effect, the dome height of 3.60 millimeters provides sufficient depth to develop a distinct, centered star, while the oval footprint balances brilliance and chatoyancy across the table. The surface has been sympathetically rounded to maintain even light diffusion across the dome, minimizing abrupt plane changes that can disrupt the coherence of the asterism. Under a single point light source, the stone displays a sharp, well defined star that traverses the dome as the light or the stone is moved, and under broader illumination the star softens while the translucency contributes to a soft, silky glow. The polished surface is free of significant laps, girdle nicks, or polishing abrasions, and the finish complements the cabochon topology to preserve the best balance between surface reflection and internal optical phenomena.

Clarity assessment at eye level indicates slight inclusions, mostly internal silk like features and a few pinpoint crystals, which are localized and do not compromise structural integrity. These oriented silk inclusions are the very features responsible for the six ray asterism, and in this specimen they produce a star that is appropriately contrasted against the light grey body color. The translucency is sufficient to allow the star to be visible without the stone appearing opaque, a combination that is often sought after for collectible star sapphires. Being untreated and unenhanced, the stone retains its natural optical character and provenance. From a gemological perspective, corundum has a hardness of 9 on the Mohs scale, which gives this sapphire substantial resistance to scratching and suitability for everyday wear when properly set, while care is still recommended to avoid sharp blows that can fracture a cabochon.

For setting and design considerations, this 0.73 carat oval cabochon is well suited to protective mounting styles that support the dome and reduce exposure of the girdle and side surfaces, a bezel setting being a common choice to secure the stone and to showcase the star with minimal risk of edge chipping. The oval footprint and modest dimensions make it adaptable for rings, pendants, and bespoke pieces where the asterism can be oriented to perform optimally in typical viewing positions. The light body color and translucent character lend versatility to metal choice, pairing well with both white and yellow metals depending on the design intent, and the natural, untreated origin makes it desirable for collectors seeking authentic, Ceylon sourced material. Additional detailed imagery, viewing options, and laboratory documentation can be provided by The Natural Sapphire Company upon request, to assist in confirming suitability for specific designs or for inclusion in a curated collection.