2.85 Ct. Topaz from Brazil

This Swiss blue topaz from The Natural Gemstone Company is a transparent, round shaped gem weighing 2.85 carats, with exact dimensions of 8.18 by 8.03 by 5.47 millimeters. The stone exhibits an intense blue tone characteristic of Swiss blue topaz, achieved through controlled irradiation enhancement. Clarity is graded as very very slightly included when viewed at eye level, indicating that inclusions are negligible to unaided vision, and polish has been evaluated as excellent across all facet surfaces. Originating from Brazil, this specimen presents a deep yet balanced profile that communicates both saturation and brilliance, making it a technically interesting piece for designers and connoisseurs who appreciate deliberate cutting decisions and stable color treatment.

The mixed brilliant cut applied to this round topaz is engineered to maximize light return within the constraints of topaz optical properties. In this execution the cutter has combined a brilliant style crown with a modified pavilion geometry, producing a complex interplay between small crown star and kite facets, and larger pavilion mains that act to redirect internally reflected beams back through the table. The average overall depth of approximately 67.5 percent serves to concentrate color and increase the light path length, which enhances perceived saturation without sacrificing scintillation. Facet junctions are tightly executed and symmetry is maintained to ensure angular alignment of crown and pavilion facets, which is essential for achieving consistent contrast patterning and a symmetrical light performance across rotation.

From a gemological standpoint, topaz has a moderate refractive index, approximately in the range of 1.61 to 1.64, and a relatively low dispersion value in the order of 0.014, so the cutter must rely on facet arrangement and surface quality to create liveliness rather than spectral fire. The mixed brilliant strategy used here compensates for the low dispersion by increasing the number of reflecting planes on the crown, which enhances scintillation and the perception of brightness as the stone moves. The deeper pavilion geometry lengthens internal light trajectories, reinforcing the intense Swiss blue hue produced by irradiation, while the polished facet planes deliver crisp light return with sharp contrasts between bright flashes and darker windows. The net optical result is a strong central brightness surrounded by a finely faceted halo, producing the star like pattern evident when the gem is viewed face up, and a balanced flash pattern when tilted.

Craftsmanship details further underscore the technical quality of this topaz. The girdle has been controlled to a practical thickness to allow secure setting without impeding light flow, and the excellent polish minimizes surface scatter that would otherwise dull brilliance. The very very slightly included clarity grading at eye level means the stone is effectively eye clean for most conventional jewelry applications, while retaining internal characteristics that can aid identification and provenance tracing. For designers, the stone presents a reliable combination of stable, irradiated Swiss blue color, robust cut geometry, and consistent facet symmetry suitable for solitaire rings and precision mountings. The Natural Gemstone Company stands behind the documented specification of this 2.85 carat, round Swiss blue topaz, cut to optimize its inherent optical behaviour, with dimensions 8.18 by 8.03 by 5.47 millimeters, excellent polish, and Brazilian origin.