1.85 Ct. Blue Sapphire from Tanzania

This transparent 1.85 carat oval blue sapphire measures 7.07 x 5.97 x 5.02 mm, and has been fashioned in a mixed brilliant cut that combines a brilliant style crown with faceted pavilion geometry engineered to maximize light return. The cut proportions are optimized for an oval outline, creating balanced table to depth ratios and controlled facet junctions that minimize light leakage, the clarity is slightly included when evaluated at eye level, and the polish is excellent, resulting in crisp facet planes and sharp facet intersections that enhance internal contrast. This sapphire is untreated, no enhancement, and its Tanzanian origin contributes to an intensely saturated blue, a color intensity graded as intense, that is both deep and evenly distributed across the girdle, the gem presents a conservative yet elegant face up size that is ideal for precision mountings and settings, The Natural Sapphire Company can provide mounting recommendations to preserve the optic performance of this stone.

The structural and optical properties of corundum in this specimen create a sparkle that is unmatched by many other gem materials, the mixed brilliant architecture uses a brilliant crown plane to produce numerous small light return facets, while the pavilion configuration channels light back through the table with a measured interplay of contrast and flash, the result is a complex scintillation pattern that combines broad flashes of rich blue with pinpoint brilliance. The inherent refractive index of sapphire produces strong internal reflection, and the very high polish ensures those reflections are undiminished, pleochroism in this Tanzanian sapphire contributes variable blue to slightly violet tones as the stone is rotated, adding dynamic color shift without sacrificing brightness. Slight inclusions, present at eye level, act as natural light scatterers in small measure, enhancing scintillation rather than obscuring it, the absence of heat or other enhancements means the lattice and inclusions are original, providing predictable aging and stability, overall the precision cutting, intense natural color, and superior polish converge to deliver a lively, three dimensional sparkle that stands out in hand, The Natural Sapphire Company stands behind the gemology and provenance of this sapphire and can assist with technical details for bespoke settings.