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

One beautiful translucent 15.88 carat oval shape purple star sapphire is offered by The Natural Sapphire Company, it measures 14.48 by 10.88 by 8.47 millimeters, it is fashioned as a cabochon cut to maximize chatoyancy and display of the star, it exhibits intense color intensity and an excellent polish, and crucially it has no enhancement, its origin is Ceylon Sri Lanka. This stone presents a clear and velvety purple that is rich without being overly dark, a quality that allows the six ray star to be sharply defined across the dome when illuminated by a single point light source. The cabochon profile and balanced proportions are optimized for asterism, producing a star that is centered and mobile, an effect that will glide across the surface as the stone or the light is moved. For the educated buyer, these combined attributes of weight, cut, color, origin, polish, and natural state create a gem that is both visually compelling and technically sound, a piece that will stand out among other sapphires and attract attention in a fine jewelry setting.

The clarity grade of this star sapphire is slightly included, evaluated at eye level, but the inclusions are precisely the feature that gives this gem its unmistakable signature. Fine oriented rutile needles, commonly called silk, intersect within the corundum to form a dense, radiating network that generates a sharp six ray star. The needles are uniformly distributed enough to produce a bright and well defined asterism, yet discrete enough that the stone retains a pleasing translucency and depth of color. Within the field of view under magnification, one can observe growth zoning and minute platelets that reflect light in a way that enhances the stone with a velvety sheen, a trait much sought after in classic Ceylon star sapphires. These internal fingerprints are diagnostic of natural formation, and because the stone is untreated, they serve as provenance evidence that cannot be replicated by heating or filling, a point of assurance for the connoisseur and collector.

Grading this gem in terms of color, cut, and finish reinforces its appeal. The intense purple hue is unusually saturated for asteriated sapphires from Sri Lanka, sitting in a range that is attractive to both collectors and designers who value color over mere rarity. The cabochon cut has been executed to a profile height that allows the star to be bold and centered while preserving an elegant oval outline suitable for many mounting styles. The excellent polish ensures that light moves over a smooth surface, enabling the star to appear crisp rather than diffused, and the stone remains free of any evidence of enhancement, which confirms both its natural state and higher market value. At 15.88 carats, this is a substantial wearable size for a star sapphire, a weight at which rarity increases markedly per carat, and it is precisely at this scale that the combination of asterism and color becomes most impressive for display in a ring or pendant.

For the informed buyer who values documented origin and natural state, this Ceylon purple star sapphire offers both aesthetic distinction and sound gemological attributes. The unique inclusions act as an internal signature, a natural fingerprint that distinguishes this gemstone from synthetics and heavily treated stones, and they enhance the stone rather than diminish it, by creating the very phenomenon that defines star sapphires. When set in jewelry, a single point light source such as a lamp or a candle will animate the star, and settings that protect the cabochon dome while allowing light to reach it will preserve the gem for decades of wear. The Natural Sapphire Company stands behind the description and provenance of this stone, and we can provide detailed imaging and grading documentation on request to support purchase and future resale. If you are seeking a star sapphire that combines classic Ceylon character, an intense purple color, visible and characteristic rutile silk, and the assurance of no enhancement, this 15.88 carat oval cabochon is a rare and rewarding choice. Please contact The Natural Sapphire Company for further details, additional photographs under controlled lighting, and guidance on mounting options that will showcase the star to best effect.