1.23 Ct. Bluish Green Sapphire from Tanzania

This listing describes a transparent, natural, 1.23 carat oval bluish green sapphire from Tanzania, presented by The Natural Sapphire Company. The gem measures 6.89 by 5.81 by 3.84 mm, and is fashioned in a mixed brilliant cut, combining the light performance of brilliant faceting with the color conservation of step facets. Clarity is graded slightly included when evaluated at eye level, the color intensity is described as intense in the bluish green spectrum, and polish is excellent. Importantly, the stone is unenhanced, showing its natural material properties without heat treatment or chemical diffusion. These objective specifications set the foundation for a gem that balances visual impact with technical merit, ideal for a buyer who values provenance and artisanal cutting decisions that optimize both hue and light return.

Technically, the mixed brilliant cut used for this oval is calibrated to achieve a specific balance between scintillation and color saturation. The pavilion is cut with brilliant style facets to maximize internal return and lively sparkle, while the crown features stepped facets that reduce excessive light leakage and preserve body color. With a measured depth of 3.84 mm relative to the mean of the length and width, the depth percentage is approximately 60.5 percent, a proportion that supports strong light return without sacrificing the stone s saturated tone. Crisp facet junctions and an excellent polish enhance mirror like surface reflections, and the controlled table size typical of high quality mixed ovals limits the window effect so that the intense bluish green body color reads consistently across the face of the gem. The overall faceting schema emphasizes calibrated angles and facet proportions rather than maximal dispersion, a conscious choice for colored stones where hue and saturation are primary determinants of perceived beauty.

The slightly included clarity grade describes minor natural features visible at eye level, features that are common in natural corundum and which do not compromise toughness or wearer confidence. In this sapphire the inclusions are limited and internal, allowing the stone to remain highly transparent and to exhibit strong internal light paths. Because the gem is unenhanced, those internal features become part of the natural signature of the material, and they provide useful evidence of origin when combined with trace element chemistry. Tanzanian sapphires often display a particular balance of iron, titanium, and occasional vanadium, and in this stone the iron and titanium contributions are consistent with the bluish green hue. The absence of heat treatment preserves subtle color zoning and natural crystal growth patterns, features appreciated by collectors and connoisseurs who prioritize untouched material. Structurally, corundum s hardness and toughness make this sapphire suitable for everyday wear, and the cutting and polish techniques employed by our lapidary team at The Natural Sapphire Company enhance durability at the girdle and pavilion junctions.

When comparing brilliance to more common gemstones, corundum occupies a distinct optical niche. Sapphires have a refractive index of approximately 1.76 to 1.77, higher than beryl varieties such as aquamarine and emerald which have refractive indices near 1.57 to 1.58, and higher than many tourmalines which fall near 1.62 to 1.64. That higher refractive index produces stronger internal reflection and typically crisper facet contrast compared with those lighter index gems. Sapphire dispersion is low relative to diamond, roughly 0.018 compared with diamond s 0.044, so the stone does not throw the spectral fire of a diamond. However, relative to colorless or lightly colored gems, an intensely saturated bluish green sapphire such as this can read as more vibrant and lively in direct lighting, because the mixed brilliant cut concentrates scintillation and contrast patterns within the saturated body color. In practical terms, the result is a stone that appears richly colored, with brisk, controlled flashes of light that emphasize the hue rather than prismatic fire. For buyers seeking a standout center stone, the combination of Tanzanian origin, intense bluish green saturation, mixed brilliant faceting, eye level transparency, and no enhancement offers a rare and technically refined option, one that translates into remarkable presence in a variety of settings, from classic solitaire rings to precision halo and bezel designs.