1.65 Ct. Bi Color Sapphire from Africa

This 1.65 carat radiant shape bi color sapphire from Africa presents a compelling combination of precise cutting, transparent clarity, and intense color that is immediately suitable for a statement piece. The stone measures 7.25 by 5.91 by 3.74 millimeters, yielding an average proportional depth of approximately 57 percent, a dimensional balance that emphasizes face up spread while preserving internal light performance. The radiant cut applied to this sapphire is a mixed facet design that marries the trimmed rectangular geometry of an emerald style outline with a brilliant facet schema on both crown and pavilion, creating a lively balance of broad flashes and scintillation. The crown facets are angled and sized to disperse light across the bi color zones, and the pavilion facet pattern has been executed to reduce windowing and to reinforce return of light through the table. The excellent polish reported on this gem ensures that facet junctions are crisp and that light transitions remain uninterrupted, maximizing both sparkle and the perception of depth across the two dominant hues.

Color is the defining characteristic of a bi color sapphire, and this specimen exhibits intense color intensity, with a clear yellow body and distinct cool blue or greenish blue zoning. The bi color effect likely results from the differential distribution of transition element impurities, with iron and titanium concentrations varying across the crystal lattice, producing zones that interact differently with incident light. Because corundum is pleochroic, the sapphire reveals different hues when rotated under directional lighting conditions, a feature that is accentuated by the radiant cut which presents multiple facets for color interplay. The intensity grade being described as intense indicates strong saturation in the relevant color zones, which enhances the gem's presence when set as a centerpiece. The transparent nature of the material allows the bi color interplay to be visible even under typical room lighting, producing a dynamic appearance that shifts subtly with perspective, an effect prized by connoisseurs who appreciate active gemstones rather than flat, homogenous color.

Clarity is graded as very very slightly included when evaluated at eye level, effectively rendering the stone eye clean for most practical viewing distances and settings. Under loupe inspection or when the gem is rotated in certain light orientations, only minute inclusions are visible, and these inclusions are positioned in such a way that they do not detract from the color distribution or the overall light return of the stone. The lack of enhancement is a critical factor in valuation and desirability, because the color and transparency are natural and unaltered, assuring collectors and clients that the hue and saturation are intrinsic to the rough material. Untreated sapphires with vivid color and superior cutting command particular interest among knowledgeable buyers, and this piece sits within that category. The combination of untreated origin, transparent body, intense color, and superior polish provides assurance of both beauty and authenticity, attributes that The Natural Sapphire Company consistently documents and certifies for its clients.

From a design and setting perspective this sapphire is ideal for a statement piece, because the 1.65 carat weight and rectangular radiant footprint provide significant visual scale on the finger, in a pendant, or in a cocktail ring. The measured spread of just over seven by six millimeters creates a presence that reads larger than many round stones of similar weight, due to the rectangular outline and efficient table area. The radiant cut also accommodates a variety of mounting approaches, with prong settings that expose the pavilion to light to maximize brilliance, halo settings that amplify perceived size while accentuating the two tone character, and bezel or partial bezel mounts that emphasize the stone as sculptural and modern. The inherent hardness of corundum at nine on the Mohs scale means that the sapphire is exceptionally suited to daily wear, and the eye clean clarity simplifies the setting process because minimal masking is necessary. For collectors seeking a centerpiece that combines technical precision in cutting, natural and intense bi color character, and an untreated African origin, this radiant sapphire represents a refined and verifiable option from The Natural Sapphire Company.