1.17 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This is a transparent, Other certified Blue sapphire weighing 1.17 carats, presented in an elegant oval shape with exact dimensions of 6.73 by 5.52 by 3.97 millimeters, certified and described by The Natural Sapphire Company. The gem displays a medium color intensity that reads as a classic Ceylon blue, derived from its Sri Lankan origin, and it is completely untreated, enhancement none. The cutting style is a mixed brilliant cut, executed to balance color saturation and light performance, and the clarity grade is slightly included when evaluated at eye level, reflecting minor natural features that do not detract from overall transparency. The polish is graded excellent, resulting in crisp facet junctions and strong surface reflection, and the length to width ratio of approximately 1.22 yields a proportionally pleasing oval profile that sits well in both solitaire and multi stone settings.

Technically, the mixed brilliant cut employed here uses a brilliant facet arrangement on the crown combined with a modified facet scheme on the pavilion to optimize both brilliance and color depth. Crown facets are sized to create a generous table that allows the eye to perceive the sapphire’s true hue, while the pavilion facets are arranged to control light return and reduce leakage through the girdle, yielding pronounced scintillation without sacrificing saturation. The measured depth of 3.97 millimeters produces a depth percentage of approximately 64.8 percent when calculated against the average of length and width, a depth range that is well suited to ovals and supports crisp contrast and lively flash when viewed face up. The cutter’s decision to employ a mixed brilliant topology is deliberate, it emphasizes flashes of white light from brilliant crown facets while using pavilion geometry to focus blue body color into the table, resulting in an appearance that changes subtly with viewing angle.

From a clarity and craftsmanship perspective, the slightly included grade at eye level indicates natural inclusions that are small and localized, often internal needles or pinpoint crystals typical of corundum from Ceylon. These inclusions act as minor light scattering centers, sometimes contributing a softened sparkle and character, without creating windows or significant light loss. The excellent polish further mitigates the visual impact of internal features, because sharp facet edges and even polishing allow maximum internal reflection and minimize surface diffusion. Structural integrity is preserved, the gem shows no signs of fractures or significant cleavage planes, and the untreated status confirms that color and clarity are fully natural, attributes that collectors and connoisseurs highly prize. Provenance from Sri Lanka imparts a well known profile of bright, lighter tone blue that is often desired for jewelry that benefits from a lively, airy blue rather than a very dark or heavily saturated tone.

When comparing brilliance to more common blue gemstones, this Ceylon sapphire stands apart in predictable technical ways. Diamond achieves greater brilliance and fire due to its higher refractive index in the order of 2.42 and its high dispersion, producing intense white light return and rainbow flashes. Corundum, with refractive indices near 1.76 to 1.77, does not display diamond level fire, but it compensates through saturated chroma and a velvety, enduring lustre that presents color as a primary optical effect rather than spectrum dispersion. Compared with blue topaz and aquamarine, which typically have lower refractive indices and paler color distributions, this sapphire delivers denser color and superior face up presence, it resists windowing and maintains a stable blue across angles due to deliberate cut proportions. Against spinel, a stone known for lively brilliance, the sapphire offers a different appeal, spinel may show stronger scintillation per unit of light because of its facet reflections, while this sapphire provides a richer color depth and subtle pleochroism, the directionality of color that can show slightly different blue tones under rotation. In short, the brilliance of this 1.17 carat Ceylon sapphire is less about diamond like fire, and more about focused color return, controlled scintillation, and enduring polish quality, all features that make it a standout choice for buyers seeking authentic, high quality blue corundum from The Natural Sapphire Company.