89.48 Ct. Blue Tanzanite from Tanzania

This exceptional specimen from The Natural Gemstone Company is an 89.48 carat, cushion shape blue tanzanite, presented with dimensions one point zero zero by one point zero zero by one point zero zero millimeters, executed in a mixed brilliant cut that marries the scintillation of brilliant faceting with the depth control of step faceting. The cutter has retained substantial weight while creating a pleasing pillow outline with softened corners and a generous table, a configuration that maximizes surface flash without sacrificing pavilion depth. The mixed brilliant arrangement places full brilliant style facets on the crown to optimize dispersed light and fire, while employing elongated step facets on the pavilion to guide rays back through the body of the stone, enhancing saturation and yielding a lively interplay of reflectance and transmission. Clarity is graded as eye clean at standard viewing distances, a critical attribute at this scale because unobstructed light paths preserve the vivid color intensity and maintain contrast between facets. The polish is excellent, a finish that refines facet junctions to razor sharpness and minimizes surface diffusion, which is essential for top tier light performance and precise facet windowing in high clarity gems.

Color presentation is central to this tanzanite, evaluated as vivid intensity, a grade that communicates strong saturation and a desirable medium to medium deep tone within the blue violet spectrum. Tanzanite displays trichroism, and the cutting orientation here has been selected to favor the primary blue violet axis, suppressing less desirable brown or gray tones and amplifying the blue component that commands premium pricing. Heat treatment is disclosed, a standard and stable enhancement for tanzanite, carefully applied to convert brownish vanadium influenced material into the cleaner blue violet hues collectors and connoisseurs seek. The treatment is permanent under normal wear conditions and was applied prior to cutting to allow the cutter to optimally orient the pavilion to the post treatment color response, ensuring that facet angles and table size work in concert with the stone s intrinsic optical properties. The result is a stone that balances face up brilliance with depth of color, permitting settings that exhibit lively sparkle while preserving the saturated body color expected in museum quality tanzanite.

The geographic origin of this gem, Tanzania, adds both contextual provenance and market value, because economically and historically tanzanite has a single well documented primary source in the Merelani zone of northern Tanzania. Material from this region exhibits a characteristic vanadium based chromophore and a typical combination of pleochroic axes that informed the cutting strategy used for this piece. Provenance from Tanzania signals geologic rarity, controlled supply chains, and an established valuation framework among dealers and collectors, factors that underpin long term desirability. The Natural Gemstone Company provides documented sourcing and handling records for pieces of this scale, a level of provenance that reinforces confidence for investment grade buyers and high end jewelers. Craftsmanship considerations were paramount in production, from the decision to employ a mixed brilliant layout to the care taken to preserve weight while eliminating visually disruptive inclusions, to the choice of final polish compounds and lap speeds that yield the excellent surface finish evident in loupe and naked eye examination.

For the technically minded buyer this blue tanzanite represents a confluence of optimized cutting geometry, stable enhancement practice, and verified Tanzanian origin, attributes that together create a gem with high visual performance and durable market appeal. The combination of a substantial carat weight, eye clean clarity, vivid color intensity, mixed brilliant faceting, and exemplary polish makes this specimen suitable for bespoke high jewelry applications where both optical performance and provenance are required. Clients can rely on The Natural Gemstone Company for detailed specification, secure handling, and assistance with mounting considerations that respect facet orientation and light performance, ensuring that the final setting complements the gem s engineered optical behavior rather than masking it.