3.99 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This listing describes a single, transparent blue sapphire weighing 3.99 carat, presented in a cushion shape with exact dimensions of 8.85 x 7.69 x 6.21 mm. The cutting style is faceted, executed as a mixed brilliant cut to combine a faceted step profile with a brilliant facet scheme, and the polish is evaluated as excellent. Clarity is graded as slightly included when examined at eye level, indicating minor internal characteristics that do not materially interrupt the overall visual performance. The color intensity is classified as intense, and importantly, this stone has received no enhancement, preserving its natural state. The origin is Ceylon, Sri Lanka, a provenance known for producing sapphires with vibrant blue hues and a lively light response. The Natural Sapphire Company presents this gem with full disclosure of its technical attributes and measurements, ideal for buyers seeking a natural, unenhanced, high saturation specimen.

The cushion outline is slightly elongated with a length to width ratio of approximately one point fifteen, creating a balanced rectangular cushion silhouette that favors both face up spread and table brightness. The mixed brilliant cutting scheme places a larger table on the crown coupled with a complex arrangement of star facets and upper girdle facets, while the pavilion integrates both step facets and small brilliant facets to optimize light return and color retention. The depth relative to the average of length and width calculates to roughly seventy five percent, a deeper profile that concentrates color and enhances saturation when viewed table up. Facet junctions are precise, and the excellent polish contributes to crisp, mirror like facet planes, which is critical for maximizing contrast and scintillation in a mixed cut configuration. The result is a structural geometry that balances broad flash and lively pinfire scintillation, suited to show both color and brilliance.

Colorally the sapphire exhibits an intense blue bodycolor characteristic of quality Ceylon material, with a primary hue of vivid blue and a very slight secondary violet leaning in certain orientations. Color saturation is concentrated by the deeper pavilion geometry, yielding a dense face up appearance without tipping into overly dark tones. Color distribution is even across the table, with minimal zoning, and pleochroic behavior is present though subtle, showing marginally different blue intensities when the stone is rotated through orthogonal viewing axes. In daylight, particularly under cool northern light, the gem reads as a pure cornflower to intense blue with excellent color purity. Under warm incandescent light the blue takes on a richer, warmer aspect with intensified depth, while under white LED point lighting the mixed brilliant facet set produces strong scintillation and crisp flashes that emphasize the saturated blue.

Clarity observations note slight inclusions visible to a practiced eye at normal viewing distance, typical of natural sapphires and indicative of authenticity and natural formation. The inclusions are not intrusive, they are small, selectively located, and in some light orientations they contribute to a soft silk effect that can moderate overly aggressive brilliance and add depth. The absence of enhancements eliminates concerns about diffusion or heat induced color changes, preserving natural crystal lattice characteristics and inclusion morphology. From a craftsmanship perspective the gem displays tight facet symmetry and consistent pavilion angles that translate to controlled light return, while the excellent surface finish ensures minimal light leakage at facet boundaries. The mixed brilliant layout is intentionally chosen to marry structural integrity with optical performance, delivering both broad color presence and dynamic scintillation.

In practical settings the sapphire will behave differently according to illumination and mounting. In direct, high intensity point light the brilliant facets will create rapid pinfire scintillation against a deep blue field from the pavilion, producing lively sparkle suitable for evening wear. In diffuse daylight the stone displays even, saturated color across the table, appearing both vivid and velvety, ideal for situations where color fidelity is key. In warm ambient light such as incandescent or candlelight the perceived blue deepens and warms, offering a more classical, regal appearance. Setting the stone in an open prong mount will maximize light access and accentuate brilliance, mounting in white metal will present a cooler color balance and emphasize pure blue tones, while yellow gold will warm the overall appearance and can enhance perceived depth. A halo of small high quality diamonds will increase perceived spread and contrast, intensifying the sapphire s color by visual comparison. The Natural Sapphire Company stands behind the gem s natural origin and finish, and recommends consideration of open settings or low bezels to preserve the mixed cut s intended light performance, making this 3.99 carat cushion Ceylon sapphire an excellent choice for a collector or an exceptional centre stone in bespoke jewellery.