1.05 Ct. Bluish Green Sapphire from Tanzania

This piece is a transparent 1.05 carat oval bluish green sapphire, cut to 6.80 by 5.15 by 3.54 millimeters, presented by The Natural Sapphire Company, unenhanced, and originating from Tanzania,. The gem exhibits intense color intensity, with a face up balance that reads clearly as a saturated bluish green, and a clarity described as very slightly included when evaluated at eye level, indicating small internal characteristics that do not compromise transparency or overall visual performance,. The mixed brilliant cut has been executed to reconcile two competing objectives for corundum, color preservation and light return, and the polish is excellent, with facet planes finished to a high luster that maximizes contrast and surface reflection,.

At a technical level the cutting strategy is a mixed brilliant format, combining a brilliant facet arrangement on the crown with a modified pavilion geometry intended to deepen and even the color while preserving scintillation,. The crown faceting concentrates on smaller star and kite facets around a proportionate table to create a lively pattern of specular reflections, and the pavilion employs a controlled set of modified facets that channel light back into the crown with measured angularity to enhance face up saturation,. The facet junctions are crisp and well aligned, the symmetry is consistent with precision cutting for an oval, and the overall depth is optimized for balance, with a calculated depth of approximately 59.3 percent of the mean diameter, a proportion that provides efficient light return without overly darkening the table area,.

Optically, corundum has a refractive index in the range of approximately 1.762 to 1.770 and a very low dispersion value of about 0.018, and those intrinsic properties shape how this sapphire behaves under different lighting,. In direct, high color temperature daylight or daylight-equivalent LED, the stone exhibits strong medium to deep bluish green saturation, with the cooler component of the light lending a perceptible blue bias at many viewing angles, while the mixed brilliant faceting translates incident daylight into abundant small-scale scintillation, producing crisp white flashes across the crown. Under warm incandescent light the same facets reveal a deeper, greener dimension to the hue, because lower correlated color temperature emphasizes the green component of the pleochroic behavior, resulting in a more enveloping, velvety presentation with softer scintillation and less crisp white sparkle. Under diffuse interior lighting or fluorescent sources the dominant impression is of even color and lowered contrast, the pavilion geometry holding color evenly and minimizing windowing, which results in a calm, saturated face up appearance that reads intensely at a glance. In low or candlelight the sapphire maintains presence due to its high color saturation, the lack of pronounced dispersion means you will not see strong spectral fire, but the stone will deliver lively contrast scintillation and color flashes when moved, giving a lively but deep visual effect that emphasizes body color over rainbow fire,.

Beyond lighting color shift, the mixed brilliant design optimizes two perceptual features important to knowledgeable buyers, brilliance and scintillation,. The high refractive index of corundum produces strong internal reflection at properly angled facets, converting a high proportion of incident photons into return brilliance, and the numerous small crown facets scatter light into a lively scintillation pattern that reads as activity in everyday wear, rather than as isolated large flashes. The very slightly included clarity grade means that light transmission is essentially unobstructed for most viewing distances, and any minor inclusions are typically masked by facet reflections and the strong color saturation, making this example particularly suitable for settings that expose the pavilion to light. The hardness of corundum, rated 9 on the Mohs scale, and the excellent polish further ensure durable surface integrity and long lasting luster.

For setting and presentation, an open gallery or four prong mounting will maximize light entry and capitalize on the mixed brilliant cut by allowing light to reach the pavilion, while a closed or foil back would deepen tone but may reduce liveliness, so the choice should align with whether you prefer color intensity or scintillation emphasis,. Metal selection will influence appearance, with white metals enhancing the perceived brightness and contrast, and warmer metals such as yellow gold accenting the green component of the hue, shifting the perceived balance toward warmer bluish green,. As an unenhanced, natural Tanzanian stone supplied by The Natural Sapphire Company, this sapphire offers provenance and a natural color profile that will respond predictably across lighting conditions, and it will appeal to buyers who prioritize original material, precise cutting to achieve balanced proportions, and a controlled interplay between color and light return,. If you require further technical data, including microscopic imaging of the internal features or additional lighting simulations to inform mounting choices, The Natural Sapphire Company can provide additional documentation and viewing options to match your technical preferences,.