5.44 Ct. Swiss Blue Topaz from Brazil

This Swiss blue topaz from The Natural Gemstone Company presents as a transparent, precisely cut round weighing 5.44 carats, with calibrated dimensions of 11.01 x 11.09 x 6.98 mm, mixed brilliant cut, vivid color intensity, and an excellent polish. The mixed brilliant approach employed here pairs a well defined brilliant style crown with a pavillion that incorporates step influenced planes, a faceting strategy chosen to balance maximum light return with deep color saturation. The crown facets are proportioned to capture and redirect incident light into the stone, while the modified pavillion planes act to retain and concentrate the blue hue within the body of the gem, producing a strong central flash and evenly distributed scintillation across the table. The measured depth of 6.98 mm over an average girdle diameter of 11.05 mm yields a depth ratio near 63 percent, a proportion that minimizes windowing while preserving the vividity of the Swiss blue color, and the girdle finish and excellent polish ensure crisp facet junctions, minimal light leakage, and optimal surface brilliance.

Optically this stone displays the hallmark blue associated with irradiated Swiss topaz, a pure, saturated blue with cool undertones and a consistent saturation from table to girdle. The enhancement by irradiation is disclosed, and the original material is natural Brazilian topaz, chosen for its clean crystal habit and predictable response to controlled radiation treatment followed by stabilizing thermal regimes. The mixed brilliant faceting accentuates the color by creating narrow, repeated facet reflections that present as kaleidoscopic bands of blue when the stone is rotated, and the polish quality raises the specular reflection, increasing apparent contrast and perceived depth. In practical gemological terms the topaz exhibits refractive behavior characteristic of natural topaz, and the cutting geometry here is tuned to the refractive indices of the species, so that the facet angles and pavilion depths maximize internal reflection and brilliance rather than sacrificing color saturation for excessive fire. The overall visual effect is a gem that reads as intensely blue at normal viewing distances, and that rewards movement with lively scintillation and controlled flashes of light.

Clarity is graded as very very slightly included evaluated at eye level, meaning that to a typical unaided eye the stone appears clean, and the inclusions that do exist are small, well healed, and readily revealed only under magnification. These internal features serve as unique identifiers, a natural fingerprint to verify provenance and continuity of ownership, and include fine healed fissures and microscopic pinpoint crystals aligned with growth planes, minute growth zoning and occasional fluid like features internal to the crystal. Rather than detract from the piece, these inclusions add character and a traceable internal map which can be useful for identification and certification, and that also speak to the natural origin of the material from Brazil. From a practical standpoint topaz has a pronounced perfect cleavage in one direction, and while this specimen is robustly cut and well finished, recommended handling includes secure setting design and care to minimize the risk of impact along the cleavage plane, a consideration that responsible jewelers and collectors respect. For buyers seeking a technically precise, visually striking Swiss blue topaz with transparent provenance and meticulous cutting, this 5.44 carat round mixed brilliant from The Natural Gemstone Company represents a considered choice, combining vivid color, excellent polish, and natural internal character that distinguishes it in any technical or collector oriented inventory.