13.15 Ct. Brown Cabochon Smoky Quartz from Brazil

This marquise shape brown smoky quartz offered by The Natural Gemstone Company presents exacting specifications that will meet the expectations of discerning gemologists and experienced jewelers, weight thirteen point one five carats, dimensions twenty three point nine eight x twelve point one nine x six point nine six millimeters, cabochon cutting style, translucent body, clarity graded eye clean at standard viewing distance, intense color intensity, no enhancement, origin Brazil. The marquise outline has been executed to maintain bilateral symmetry across the long axis, yielding a balanced profile with pointed terminations that remain robust for mounting. The cabochon dome has been shaped to optimize light transmission through a thicker central thickness and a smoothly tapered edge, allowing the brown tonal range to present consistently under varied lighting conditions while preserving the overall integrity of the stone. The eye clean clarity grade indicates the absence of visible inclusions at eye level, which enhances the gemological value for collectors who prioritize visual purity in transparent and translucent quartz material.

Craftsmanship and finishing detail are central to the character of this piece, the cabochon cut requires precise control of dome curvature and parallelism to ensure even light flow and to avoid optical distortion. On this specimen the dome exhibits a controlled curvature, achieving a pleasing compromise between height and spread that accentuates the smoky brown saturation without overthinning the pavilion area. The polish has been rated excellent, which reflects meticulous lap work using progressively finer abrasives culminating in a high gloss finish that maximizes surface luster and tactile smoothness. Edge finishing has been handled to create a clean transition from dome to girdle, which is critical for secure bezel seating and for minimizing stress concentrations during setting, the consistently polished surface also aids in evaluating the stone for any residual surface-reaching cleavages or tiny pits, none of which are present in this material. Because the piece is untreated, the natural color zoning and any subtle pleochroic tendencies inherent to quartz are preserved, providing a true representation of the Brazilian material and allowing connoisseurs to assess hue and saturation directly.

From a gemological standpoint this smoky quartz conforms to expected optical and physical parameters for quartz family material, refractive indices cluster around the established range for quartz and birefringence is modest, which combined with the cabochon profile results in a smooth, uniform appearance without pronounced internal flash or interference patterns, the translucency supports even color display while permitting a soft internal glow that can be emphasized in backlit settings. The intense brown color of this specimen is particularly well suited to designs that require a warm, earthy palette, the marquise shape provides an elongated visual axis that can enhance finger length in ring applications or create a dynamic focal point in pendant and earring designs. For mounting recommendations consider a full bezel to protect the pointed ends and to secure the domed profile, or consider a hybrid bezel prong approach that protects the termini while permitting more light access along the lateral facets of the mount. Protective settings are advised for everyday wear due to the surface exposure inherent in cabochon styles, despite the excellent polish, routine maintenance and careful cleaning with warm water and mild soap will maintain surface luster.

As a representative of The Natural Gemstone Company I can confirm that this thirteen point one five carat marquise cabochon smoky quartz is presented without any enhancement, sourced from Brazil, and prepared to professional lapidary standards, its combination of intense color, eye clean clarity, and excellent polish make it an excellent candidate for bespoke jewelry projects or for a collector seeking natural, untreated quartz specimens. If you require additional measurements, viewing images under specific lighting conditions, or consultation on ideal mounting options for this marquise cabochon, I am available to provide technical guidance and to arrange secure handling and shipping, our objective is to ensure that the gem integrates seamlessly into your design intent while preserving its natural character and gemological integrity.