0.94 Ct. Greenish Blue Sapphire from Tanzania

This gem is a transparent 0.94 carat cushion shaped greenish blue sapphire, precisely measured at 5.93 by 4.45 by 3.76 mm, presented by The Natural Sapphire Company. The stone is faceted to a mixed brilliant style, combining a brilliant facet pattern on the crown with a modified pavilion geometry, delivering controlled light return and lively scintillation. Clarity is graded as slightly included at eye level, which is typical for natural sapphires of this character, and the excellent polish ensures that facet windows and junctions present with clean, mirror like surfaces. There has been no enhancement to alter the stone, so the intense color intensity you see is intrinsic to the crystal, and the indicated Tanzanian origin contributes to the stones natural chemistry and tonal balance.

The mixed brilliant cutting approach used on this cushion shape has been executed to balance two competing optical goals, saturation of color and optical brilliance. The crown facets have been proportioned to create a large enough table to convey the stones intense greenish blue body color, while the pavilion has been modified to return light with strong flashes rather than deep undercut leakage. Facet geometry is calibrated to the stones 3.76 mm depth, optimizing internal reflection angles to maximize the apparent size and brightness for the given carat weight. Excellent polish across crown and pavilion facets enhances total internal reflection and minimizes light scatter, so even the slightly included clarity grade does not impair the stones ability to deliver vivid facet reflections and crisp scintillation. The cutter has left the girdle at a practical thickness, allowing secure setting without compromising optical performance.

Optically the sapphire demonstrates pronounced dichroic behavior, so rotation of the stone will reveal shifts between blue leaning and green leaning tones, a feature that can be accentuated by different lighting conditions. In cool natural daylight and daylight balanced LED, the blue component becomes more evident, rendering a pure deep teal to oceanic blue that reads as intense yet clear. Under warmer incandescent or candlelight the stone shifts subtly toward its greenish aspect, the warmer spectrum exciting longer wavelength responses and lending a more teal to olive blue presence, while the polished facets create soft, velvety flashes rather than high contrast white brilliance. Under strong direct sunlight the mixed cutting produces crisp flashes of brilliance and tighter scintillation, with dispersion contributing minor fire that is visible as small flashes where the facet angles concentrate white light. Diffuse interior lighting will emphasize the overall intense body color, showing a uniform, saturated tone, whereas backlighting or rim lighting will increase transparency, making internal features more visible, and can reveal the slightly included nature with subtle reflective highlights that add character rather than detract from overall visual appeal.

For mounting and wear considerations, the stones cushion outline and intense greenish blue tone pair exceptionally well with cooler white metals, which accentuate the blue component, and with yellow or rose metals when a warmer, greener presentation is desired. A four or six prong setting will allow the mixed brilliant facets to interact with ambient light, while a low profile bezel will mute scintillation but emphasize color and durability. The Natural Sapphire Company recommends evaluation of orientation during setting to align the stones dichroic axis for the desired color presentation, and to place the table and crown facets so that common lighting environments deliver the preferred balance of brilliance and saturation. Routine care with warm soapy water and a soft brush will maintain the excellent polish, and professional inspection of the setting will protect the stones slightly included integrity. This Tanzanian, untreated sapphire offers an intense, natural color, thoughtful cutting, and reliable optical performance, ideal for a connoisseur seeking technical excellence and unenhanced gem provenance.