1.69 Ct. Blue Sapphire from Tanzania

This 1.69 carat transparent blue sapphire from Tanzania combines precise cutting geometry with gemological integrity to produce a stone that projects presence in any jewelry setting. The stone measures 6.60 by 6.35 by 4.16 millimeters, an ideal dimension set for either solitary mounting or as a central element within a multi stone composition. The faceted asscher cut octagon shape relies on a series of stepped facets on the crown and pavilion to produce broad, even flashes of color and light, rather than the pinpoint scintillation of mixed cuts. The cutter has prioritized proportional balance, achieving a depth that supports rich color saturation without excessive windowing, and face up symmetry that maintains octagonal outline fidelity. The excellent polish is evident at facet junctions and girdle uniformity, permitting maximum light transmission into and back from the corundum lattice, thereby enhancing perceived color intensity and surface luster.

From a gemological perspective this sapphire demonstrates the attributes that knowledgeable buyers seek. The clarity is evaluated as eye clean at normal viewing distance, indicating that there are no inclusions that interrupt the visual plane or compromise durability. The color intensity is classified as dark, which in corundum often yields a velvety, saturated blue that reads as deep midnight to royal blue under typical lighting. Corundum refractive index values approximately 1.762 to 1.770 and a specific gravity near 4.00 contribute to the gem feeling substantial relative to its dimensions, and a natural pleochroic response is present, offering subtle variation between stronger blue and slightly purplish blue directions when the stone is rotated. The piece has been heat treated, a widely accepted and stable enhancement method used to remove silk and to equalize or intensify blue zoning, thereby improving transparency and overall color uniformity without compromising structural integrity.

The asscher cut geometry in this sapphire is especially effective for presenting deep tone color in refined jewelry designs. Step facets around a modest table create a hall of mirrors effect that emphasizes depth, allowing the rich blue to become a focal plane that shifts with wearer movement. Because step cutting tends to concentrate color, this stone will stand out in both high contrast settings and monochromatic designs. In white gold or platinum the deep blue will produce a crisp, modern contrast, particularly when paired with accent diamonds that frame and reflect light into the pavilion facets. In yellow gold the warm metal will warm the viewer perception of the blue, creating a classical, saturated appearance. The stone is equally suitable for bezel settings that protect the girdle while presenting a smooth face up silhouette or for prong settings that maximize light access, depending on the desired balance between protection and brilliance.

At The Natural Sapphire Company we evaluate cutters and stones against strict standards for proportion, polish, and optical performance, and this Tanzanian asscher shaped blue sapphire exemplifies those criteria. The combination of precise asscher step faceting, eye clean clarity, dark saturated color, and excellent polish ensures that this gem will command attention in any jewelry application, producing a deep, vibrant color field that anchors a design with presence and technical refinement. Whether set as a solitaire engagement gem, a central stone in a three stone composition, or integrated into a bespoke design with contrasting accents, this sapphire will consistently read as a luxurious, technically accomplished element that elevates the overall design through concentrated color and controlled optical dynamics.