0.76 Ct. White Star Sapphire from Ceylon (Sri Lanka)

This translucent 0.76 carat oval white star sapphire measures 6.51 x 4.37 x 2.31 mm and presents as a classic cabochon cut optimized for asterism. The cutter has produced a symmetrical oval outline with a gently domed crown which allows the internal silk of rutile needle inclusions to coalesce into a sharp light star when illuminated. The star is observable as a well defined banding that radiates from the gem center, and under direct point illumination it displays clean linear rays with good contrast against the near colorless body. The stone’s translucency and near colorless color intensity produce an icy, silvery appearance rather than a strong hue, which accentuates the white star effect and makes the phenomenon the principal visual attribute. The polished surface is described as excellent, yielding a smooth, mirror like finish that minimizes surface diffusion of light and enhances asterism clarity.

From a clarity and gemological perspective this specimen is graded very slightly included when viewed at eye level, and the inclusions are predominantly fine oriented rutile silk that is integral to the star effect. There are minimal localized mineral inclusions near the girdle area that are consistent with natural formation in Sri Lankan corundum, and these do not materially affect optical performance or structural integrity for conventional jewelry use. The cabochon profile appears to have been executed with careful attention to orientation, aligning the rutile needle fabric perpendicular to the base plane so that the six ray star is centralized and mobile. The result is a balanced asterism that translates well across viewing angles, a sign of precise lapidary work. Importantly this sapphire is untreated, no enhancement, which preserves the natural silk fabric and the original crystalline state, and the origin is Ceylon Sri Lanka, a source renowned for producing white and light colored star sapphires with clean silk and stable asterism.

Technically the gem is corundum, with expected refractive indices in the range of 1.762 to 1.770 and a specific gravity near four point zero, corresponding to the standard properties of sapphire and confirming robust wearability, with a hardness of nine on the Mohs scale. For mounting and design considerations the oval 6.51 by 4.37 millimeter footprint and the 2.31 millimeter height lend themselves well to both delicate pendants and refined ring settings where the star can be displayed on top, oriented so the rays align with the wearer’s preferred axis. A high domed bezel that follows the cabochon contour will protect the girdle and preserve the polished surface while allowing full viewing of the star, whereas overly deep or closed metal backgrounds may mute translucency and reduce perceived asterism intensity. Because the stone is natural and untreated, standard care procedures for corundum apply, avoiding strong thermal shock and abrasive chemicals, and routine professional cleaning will maintain the excellent polish and star definition.

At The Natural Sapphire Company we document provenance and treatment status, and this white star sapphire is supplied with full disclosure of origin and enhancement history, in this case Ceylon and no enhancement. The combination of precise cabochon geometry, centralized six ray asterism, excellent polish, and near colorless tone makes this gem a technically interesting example for collectors and designers who prioritize natural material characteristics and lapidary craftsmanship. Its modest carat weight and compact dimensions make it an elegant choice for a focal pendant or as a refined accent in a multi stone composition, and the untreated state ensures that the natural rutile silk and asterism remain stable and authentic over time.