1.36 Ct. Bluish Green Sapphire from Tanzania

This gemstone is a transparent 1.36 carat oval sapphire, measuring 7.11 by 5.97 by 3.64 millimeters, cut as a mixed brilliant, with an eye level clarity of very very slightly included, and an intense bluish green color, originating in Tanzania, and presented by The Natural Sapphire Company. The dimensions yield a length to width ratio of approximately 1.19, a proportion that preserves the oval silhouette while promoting balanced light return across the table. The measured depth to average diameter ratio is approximately 0.556, a depth proportion that supports optimal internal reflection without allowing the body color to become overly saturated or dark. The excellent polish indicates mirror smooth facet planes, a critical factor that reduces micro surface scattering and allows unimpeded entry and exit of light through the crown and pavilion. The absence of enhancement confirms that the color and clarity are intrinsic to the crystal lattice, a quality that is increasingly sought after by collectors and connoisseurs who prioritize natural provenance and untreated optical performance.

The mixed brilliant cut on this oval sapphire has been executed with precise facet geometry to synthesize the best attributes of brilliant and modified pavilion styles, creating both strong scintillation and consistent color dispersion. The crown employs a modified brilliant arrangement of star and bezel facets, arranged to break incident light into multiple reflected paths, while the lower half uses a carefully proportioned pavilion architecture that combines angled mains with supplementary facets, tuned to harvest light and return it through the crown rather than allow leakage through the girdle. Facet junctions have been aligned to maintain sharp contrast between light and dark areas, producing controlled scintillation that reads as lively twinkle rather than chaotic sparkle. Proportional symmetry across the girdle and balance between crown height and pavilion depth were prioritized to deliver a broad table that retains depth of color, while still promoting strong face up brightness. The result is a stone that exhibits lively pin point flashes on movement, a generous field of internal flash, and a measured contrast pattern that enhances the perception of depth without sacrificing brilliance.

At the atomic level the sapphire is corundum, a crystalline aluminum oxide, whose optical behavior is governed by a relatively high refractive index and low dispersion compared with other gem materials, characteristics that make facet engineering essential to maximizing perceived sparkle. Trace transition metals, principally iron and minor quantities of titanium, are responsible for the bluish green hue through selective absorption in the visible spectrum, producing an intense saturation while maintaining good transmission. The crystal shows very very slight inclusions at eye level, meaning the internal light pathways remain largely unobstructed, allowing for extended internal reflections that contribute to the gem s depth and fire. The high polish quality combined with precise facet angles minimizes surface diffusion and preserves specular reflections, so that light undergoes multiple internal reflections before exiting as controlled flashes. The sapphire s hardness at the upper end of the scale provides exceptional durability, making it suitable for everyday wear in rings and bracelets, while the natural origin from Tanzania contributes to its distinctive color profile and mineralogical character, something The Natural Sapphire Company can trace and certify for provenance.

The overall interplay between material properties, cutting philosophy, and finishing standards is what creates a sparkle that is both technical and sensorially superior, unmatched by less carefully proportioned stones. The mixed brilliant faceting creates a dual modality of brilliance, with tight scintillation from the crown and sustained depth from the pavilion, while the eye clean clarity sustains unbroken optical paths that permit high contrast reflections. The intense but transparent bluish green color provides sufficient chroma to impart presence without absorbing the mid spectrum light that fuels brilliance, therefore the stone presents both color intensity and dynamic light performance. The excellent polish and careful girdle management reduce light leakage and maintain facet integrity under a variety of mounting styles. For the knowledgeable buyer seeking a sapphire where crystallography, trace chemistry, and lapidary precision converge, this 1.36 carat Tanzanian oval from The Natural Sapphire Company offers an engineered sparkle that rewards close inspection and wearable elegance, a gem that balances optical science and artisan skill in a manner that is readily appreciable by collectors and designers alike.