1.55 Ct. Bluish Green Sapphire from Tanzania

This transparent 1.55 carat oval bluish green sapphire measures 7.66 by 5.83 by 4.10 mm, faceted in a mixed brilliant cut to optimize both color saturation and scintillation. Color intensity is classified as intense, the polish is excellent, and the clarity grade is slightly included when evaluated at eye level. Origin is Tanzania, and there has been no enhancement, so all internal features are natural and stable. The mixed brilliant cut, with a full brilliant crown and a pavilion combining step and brilliant facets, balances light return and color concentration, allowing the stone to read its complex hue as bluish green rather than distinctly blue or green when viewed face up.

The gemstone carries a set of inclusions that together create an unmistakable signature. Fine oriented rutile silk forms planar sheens and subtle chatoyant streaks when the stone is tilted, while sparse negative crystal cavities and isolated mineral crystals act as internal reflectors, producing pinpoint scintillation against the velveteen background. Growth zoning is visible as narrow, slightly undulating bands parallel to the girdle, and these zones interact with pleochroic directionality to shift the dominant tone between blue and green as the pavilion facets redirect light. Small feather clusters are confined and healed, imparting a soft internal texture rather than compromising transparency, and selective facet junctions catch minute crystal platelets to create localized glints. The cumulative effect of these inclusions is diagnostic, a fingerprint that manifests as a layered internal landscape, revealing orientation, growth history, and the natural state of the sapphire without the homogenizing effect of heat or filling.

The cutter at The Natural Sapphire Company intentionally preserved this inclusion architecture, choosing facet angles and pavilion depth to emphasize the internal map while maintaining brilliance. The crown facet array opens the stone to direct viewing of the growth bands, while the precision of the pavilion facets channels light through the silk and crystal inclusions to produce dynamic flashes and subtle color modulation. For setting, a minimal bezel or open prong mounting is recommended to permit light exchange and to let the inclusion signature remain visible in different lighting conditions, an attribute prized by technically discerning collectors who value natural character and provenance in rough to gem transformation.