1.53 Ct. Pinkish Purple Star Sapphire from Ceylon (Sri Lanka)

This oval cabochon star sapphire presents a precise combination of weight, proportions, and optical phenomena, making it a specimen that appeals to technically minded collectors and gem setters. The gem weighs 1.53 carats, and measures 6.14 x 5.09 x 5.10 mm, with the length to width ratio tuned to an elongated oval that optimizes the display plane for asterism. The cutting style is a traditional domed cabochon, specifically oriented along the corundum c axis to maximize the six ray star. The material is translucent rather than fully transparent, which promotes internal scattering that enhances the sharpness and contrast of the star without washing out the saturated body color. Color grading at eye level produces a pinkish purple appearance with intense color intensity, and the stone reads as evenly colored across the table when viewed under standard daylight balanced illumination. Clarity is graded as very slightly included using an eye level evaluation, meaning that needle inclusions and minor mineral traces are present but do not detract from the visual performance of the asterism. There is no enhancement, the stone is natural and untreated, and the provenance is Ceylon Sri Lanka, a source historically noted for high quality star sapphires. The Natural Sapphire Company name is attached to this offering, to indicate that this gem has been selected and imaged as part of our curated inventory.

From a lapidary and optical engineering perspective the asterism is the primary determinant of value and of mounting strategy, and this piece demonstrates well executed cutting and finishing choices. The star is generated by intersecting concentrations of oriented rutile needles that run parallel to crystal growth directions, and the six ray configuration indicates three sets of oriented inclusions intersecting at near 60 degree spacing. The cutter has positioned the cabochon dome apex to align closely with the intersection of those needle sets so that the star is sharply defined and centered when illuminated perpendicularly. Dome height relative to the base thickness at 5.10 mm preserves sufficient material to allow a crisp star without risking windowing or core visibility that would reduce the overall color effect. The polish is graded excellent, with a smooth, reflective surface that supports specular highlights at the apex while maintaining the diffusive quality necessary for a star to resolve. The preforming phase focused on removing irregular crystal terminations and orienting the preform axis, followed by progressive grinding and lapping sequences that culminate in fine abrasive polishing, to both preserve the intact silk structure that produces asterism and to achieve the clean, glossy finish evident in imagery. Minor natural inclusions are present but are compensated for by the stone geometry and polish, resulting in a visually dominant and stable six ray star.

Practical considerations for setting and presentation follow directly from the physical and optical characteristics of the gem, and are relevant to jewelers and technical buyers. Because the star is strongest when light falls perpendicular to the dome, set designs should maintain the dome apex unobstructed, using bezel mounts with an open crown design or a low profile prong approach that secures the girdle without impinging on the light path to the dome. The 5.10 mm thickness provides structural depth that supports secure settings and reduces the risk of damage during mounting, while the 6.14 x 5.09 mm footprint fits comfortably into a range of classic and contemporary settings for rings, pendants, and bespoke pieces. The intense pinkish purple body color benefits from settings in metal tones that enhance warm or neutral hues, and the natural, unenhanced state of the stone appeals to collectors who prioritize provenance and minimal intervention. For institutional or private collectors who require formal documentation, The Natural Sapphire Company can provide detailed information on measurements, weight, origin, cut style, clarity grade, color assessment, and the no enhancement designation, to support appraisal and certification processes. Overall this 1.53 carat Ceylon star sapphire pairs rigorous lapidary technique with notable optical performance, making it a technically compelling example for informed buyers.