15.24 Ct. Greyish Blue Star Sapphire from Ceylon (Sri Lanka)

One of the most compelling pieces in our current collection is this translucent 15.24 carat oval greyish blue star sapphire, presented by The Natural Sapphire Company. Measuring 13.34 x 10.87 x 9.23 mm, with a classic cabochon shape and an excellent polish, this stone offers an immediate visual impact that few star sapphires achieve. The medium color intensity of the greyish blue hue is versatile for jewelry, combining subtlety with presence, while the cabochon cut amplifies the six ray asterism that defines a true star sapphire. Evaluated at eye level as very slightly included, the clarity gives the sapphire depth without distracting from its luminous star, and crucially this gem has received no enhancement, a quality that collectors and buyers who value natural origin will recognize as increasingly rare. The origin of Ceylon, Sri Lanka, further positions this sapphire within a storied tradition of fine gems, and the combination of size, untreated status, and Ceylon origin makes this stone a notable offering in the market.

When compared to many of the star sapphires commonly available, this Ceylon piece stands out on several technical and aesthetic levels. Many commercial star sapphires are heat treated to improve color, or worse, have undergone filling or other enhancements that compromise long term value and make the stones more fragile. Synthetic or assembled imitations can show a star, but they lack the subtle, genuine depth of light scattering that comes from fine rutile inclusions in a natural corundum matrix. By contrast, this natural, unenhanced stone brings together translucency and well developed silk that produce a clean, centered star, and the excellent polish ensures the asterism is crisp and responsive to light. In the market segment where buyers are choosing between larger but heavily treated stones and smaller untreated gems, this stone occupies an optimal middle ground, delivering a commanding carat weight with no treatments to muddy provenance or long term durability.

Beyond treatment status, the cabochon shape and dimensions of this sapphire create a viewing experience that many faceted sapphires cannot match. Faceted stones are designed to return light through precise angles, and for color sapphires that strategy works well, but a star sapphire relies on internal parallel inclusions to generate asterism, and only a well proportioned cabochon will produce the classic, centered star that collectors prize. At 13.34 by 10.87 mm and nearly 9.23 mm deep, this oval presents a generous dome that allows the star to form and move gracefully across the surface as light shifts. The medium color intensity provides a balanced backdrop, allowing the silvery white star to contrast attractively against the greyish blue body color, rather than being overwhelmed by an overly dark tone or lost in a pale wash. Compared to many stones that show a weak or off centered star because of poor cutting or inadequate dome height, this gem demonstrates considered lapidary skill and an eye for proportions that enhance optical phenomena.

Ceylon origins bring particular advantages that affect both aesthetic preference and investment value, and this sapphire exemplifies those qualities in a way that makes it stand apart from many stones from other locales. Sri Lankan sapphires often display velvety, luminous blues and greys that are soft yet striking, and connoisseurs frequently seek untreated Ceylon material for its natural expression of color. Stones from other regions, while attractive in their own right, tend to be marketed differently, with Burmese material prized for deep saturated blues and Madagascan and Thai material often offered at different price points and with more common treatments. Because this sapphire is unenhanced, it preserves the natural signature of its Ceylon origin, which is increasingly rare in an industry where heating and other improvements are standard practice. For buyers who are deciding between a treated stone with intense color and a natural stone with authentic provenance and a charming, natural star, this untreated Ceylon piece is a compelling option that blends aesthetic appeal with long term collectibility.

Choosing this star sapphire from The Natural Sapphire Company also makes practical sense for anyone who cares about transparency, expertise, and responsible sourcing. Our team evaluates gems with consistent gemological standards, and we present clear, measured details including carat weight and exact dimensions so buyers can assess how the stone will sit in a design. For jewelry considerations, the oval cabochon will translate beautifully into a statement ring with a pronounced dome or into a pendant that showcases the star at the center of attention, and because the stone is corundum it offers durable wear characteristics for everyday use when set securely. We advise settings that allow light to strike the dome from multiple angles, and designs that elevate the cabochon slightly will enhance the star movement. In direct comparison to mass market options that prioritize immediate visual intensity at the expense of natural origin, this stone offers a superior blend of authenticity, optical character, and lasting value. If you are seeking a large, genuinely untreated star sapphire with clear provenance and excellent lapidary finish, this Ceylon greyish blue oval is an exceptional choice.