0.84 Ct. Purple Star Sapphire from Ceylon (Sri Lanka)

This listing presents one translucent 0.84 carat oval purple star sapphire, precisely measured at 6.50 x 4.91 x 2.66 mm, offered by The Natural Sapphire Company. The gem is fashioned as a classic cabochon, with an oval outline chosen to balance face up spread and depth, and the cutting orientation aligns the corundum crystal c axis perpendicular to the base to optimize the asterism. Clarity has been evaluated at eye level as very slightly included, a designation indicating the presence of minor internal features that are visible to careful unaided inspection but do not materially detract from the optical performance of the star. Color is graded as medium intensity, yielding a saturated purple that displays even distribution across the table, and the surface has been given an excellent polish, producing smooth reflection and minimal surface disturbance. There has been no enhancement applied to this stone, the material is in its natural state, and provenance is Ceylon Sri Lanka, a source renowned for high quality corundum and well developed silk structures that produce strong star effects.

The star phenomenon in this specimen is produced by oriented rutile needle inclusions that form a dense silk network, and the cabochon cut has been executed with a dome profile and polish designed to render a sharp, six ray asterism under a single overhead point light. The cutter has negotiated the balance between dome height and table diameter to ensure the star concentrates and remains cohesive rather than splitting into diffuse bright areas, and the dome curvature is moderate to allow consistent star mobility when the gem or light source is moved. From an optical and gemological standpoint, corundum has a refractive index range around 1.762 to 1.770 and a specific gravity near 4.00, properties that inform lapidary decisions on dome angles and thickness to control light transmission and star contrast. The translucency of this piece permits light to be transmitted to the silk layers while maintaining sufficient body color to display the purple hue, and the result is a star that is observable over a range of viewing distances, strongest with a focused overhead point light and still visible in indirect lighting.

The very slightly included clarity assessment is primarily the productive silk responsible for asterism, and these inclusions are internal oriented features rather than fractures or surface reaching cavities, therefore they are integral to the star rather than detracting clarity flaws. The medium color intensity indicates a balance between saturation and tone, the purple is neither washed nor opaque, and the hue remains stable across the face without significant zoning. The excellent polish speaks to professional lapidary finishing, with a smooth, high gloss surface that minimizes stray reflections that could diffuse the star or interfere with its sharpness. Because there has been no heat treatment or diffusion applied, the trace element chemistry responsible for the purple, commonly chromium in combination with iron and titanium in variable proportions, is presented in natural balance, and the absence of enhancement is an important factor for collectors and connoisseurs who prefer untreated material from a historic source such as Ceylon Sri Lanka.

For practical use and setting recommendations, the oval dimensions and cabochon profile make this 0.84 carat star sapphire well suited to ring center settings, pendant mounts, or bespoke collectors mounts where the dome and star can be displayed with a single overhead viewing plane. A bezel or low bezel setting provides both protection for the domed surface and an unobstructed field for the asterism to be viewed, while prong settings with an open top may expose the dome and are acceptable when protective design considerations are included. Cleaning is best done with warm soapy water and a soft brush, avoid harsh chemicals and ultrasonic cleaners when significant silk or internal features are present, and store the piece separately to prevent abrasion to the polished dome. The Natural Sapphire Company is available to provide additional technical images under controlled lighting to demonstrate the star mobility, and to discuss setting recommendations or bespoke design options for this natural, unenhanced Ceylon purple star sapphire.