3.09 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This sapphire is a transparent, untreated, three point zero nine carat cushion shape, with dimensions eight point five three by six point seven eight by five point two two millimeters, cut in a mixed brilliant style and originating from Ceylon, Sri Lanka. The mixed brilliant geometry combines a modified brilliant arrangement on the crown with complementary pavilion facet relationships, producing a balance between broad color windows and controlled facet reflections. The table is proportioned to present a deep, concentrated blue field, while the crown facets are engineered to introduce measured scintillation across the face. The pavilion faceting has been calibrated to preserve depth, and the overall symmetry and excellent polish demonstrate careful lapidary control aimed at maximizing both color saturation and the return of light. Clarity is graded as very slightly included when evaluated at eye level, indicating only minor internal features that do not interrupt the visual field, and no enhancement has been applied which preserves the original crystal chemistry and surface state. The Natural Sapphire Company presents this stone as a fine example of untreated Ceylon material, where natural zoning and color distribution contribute to character.

Optical behaviour across lighting environments reveals the technical impact of the cut and the stone s dark color intensity. In strong, direct daylight, the sapphire exhibits a velvety, deep blue field with discrete flashes of lighter blue as facet angles catch the sun, these flashes arising from the interaction between crown facet tilt and the gem s inherent pleochroism. Under cool white LED lighting the mixed brilliant crown generates crisp, small scale scintillation with concentrated blue flashes, the pavilion depth maintaining a saturated body color that resists washing out. In incandescent or warmer halogen light the sapphire shifts subtly toward a richer, slightly warmer blue, as the lower color temperature enhances the perception of depth and reduces apparent contrast between facet windows and the body color. In low light and candlelit conditions, the dark tone translates into a more uniform, inky blue appearance with isolated bright flashes from acute facet edges, making the gem read as an intense jewel tone rather than a highly brilliant stone. Diffuse lighting emphasizes the stone s evenness of color, while directional spot lighting accentuates facet contrast and reveals the precision of the mixed brilliant architecture.

From a clarity and finish perspective the very slightly included grade at eye level speaks to both aesthetic and structural considerations. The internal features present are localized and small, and they have been oriented by the cutter so that they minimally interfere with the primary light pathways, this approach preserving both apparent transparency and the continuity of color. The excellent polish across facet planes ensures minimal surface scattering, which is especially important in a dark intense sapphire, because surface fidelity maximizes transmitted and reflected light and preserves crisp facet junctions. The mixed brilliant cut, by design, mitigates the tendency for dark toned stones to appear dull by introducing a network of high angle crown facets that create micro reflections, these micro reflections generate perceived motion and spark without compromising the deep body color. Girdle thickness and symmetry have been executed to facilitate secure setting options while maintaining an optimal table to depth relationship, and the intact proportions and cabochon free surfaces point to high workmanship. The untreated origin from Ceylon is an important factor for connoisseurs, because natural color and crystal growth patterns from that region produce the sort of saturated, velvety blues that are prized in fine sapphire grading.

For mounting and daily wear considerations the stone benefits from a setting strategy that allows light to enter the pavilion and return through the crown, while protecting the corners of the cushion profile. Prong settings with minimal bezel coverage at the girdle and an open gallery will enhance the stone s ability to interact with ambient light, and a low profile undercarriage control will prevent undue light leakage that can reduce perceived saturation. Metal choice will materially affect the visual outcome, white metals maximizing contrast and clarity, while warmer alloys can subtly emphasize the stone s richer blue nuances, decisions that skilled setters at The Natural Sapphire Company can assist with. For jewellery designed to showcase color intensity, a solitaire or halo with small white accent stones will preserve the sapphire s dominant color presence, while for everyday pieces a secure four or six prong design with protective shoulders is recommended. This cushion shape three point zero nine carat, mixed brilliant cut, untreated Ceylon sapphire, with its excellent polish and very slightly included clarity at eye level, is a technically refined gemstone that will display deep, saturated blue tones in most lighting conditions, with dynamic flashes and precise scintillation when light is directed across its mixed facet system, it is well suited to collectors and designers who value original provenance and meticulous lapidary technique.