4.76 Ct. Bluish Purple Star Sapphire from Ceylon (Sri Lanka)

This specimen is a translucent 4.76 carat round star sapphire, with measured dimensions 9.86 by 9.99 by 4.59 millimeters, cabochon cut, and a clarity grade of very slightly included when evaluated at eye level. The proportions are notable, with a dome height to diameter ratio of approximately 46 percent, a geometry that favors pronounced asterism while maintaining overall wearability in standard ring and pendant settings. The gemstone displays a bluish purple hue with light color intensity, and the saturation sits in the low to moderate range, creating a soft, silvery appearance that complements the six ray star. The polish is excellent, with a smooth, mirror like finish across the dome that allows the star to appear crisp and reflective under point light sources, and the piece is natural with no enhancement, preserving original silk structures and natural color characteristics from its Ceylon origin.

Technically the star manifests from intersecting rutile needle inclusions aligned along trigonal symmetry, producing a classic six rayed asterism that converges at the visual center. The cabochon was oriented and shaped to the crystallographic c axis to maximize star definition, and the relatively tall dome concentrates light return into a sharp, centralized star. The star shows strong centration and good mobility, translating across the dome when the stone is rotated under a focused light source, evidence of a homogenous needle orientation and consistent internal silk. Clarity is very slightly included at the loupe free level for typical viewing distances, the minor inclusions are responsible for the asterism and do not disrupt the overall translucency, and the surface finish shows careful lapidary work with even girdle thickness and a well proportioned base to facilitate secure setting.

Comparatively, historical famous star sapphires illustrate the range of what asterism can achieve, and this piece relates most closely to those legendary examples by virtue of its Sri Lankan provenance and natural asterism. The Star of India and the Black Star of Queensland represent extremes of size and body color, while the Logan and Star of Asia emphasize saturated blue for exhibition. This 4.76 carat Ceylon star sapphire distinguishes itself by offering a delicate bluish purple hue with a soft, silvery star, a combination seldom found in larger natural specimens without treatment. Unlike many commercial stones that receive heat or diffusion to enhance color or clarity, this stone remains unenhanced, a quality prized by collectors and connoisseurs who value original silk and untreated color, and its translucency generates a more ethereal, vintage aesthetic rather than the deep velvety appearance of heavily saturated faceted sapphires.

From a craftsmanship and collector standpoint this round cabochon is exceptionally versatile and rare given its untreated status, precise cutting, and Ceylon origin. The combination of a well centered six ray star, excellent polish, and a tall dome makes it ideal for a minimalist bezel or a low prong mounting that preserves the symmetry and allows controlled light play. For connoisseurs who appreciate technical nuances, the stone offers study of rutile orientation and star mobility, and for jewelers it offers a reliable proportion for standard mounting tools. The Natural Sapphire Company presents this star sapphire as a museum quality yet wearable stone, a balanced example of Sri Lankan asterism that references the grandeur of historical pieces while offering a unique bluish purple personality. Please contact us for additional measurements, viewing guidance, and setting recommendations, we can provide high resolution illumination studies to demonstrate star behavior under different light angles.