13.64 Ct. Cabochon Smokey Quartz from Brazil

This description profiles a single translucent brown smoky quartz specimen weighing 13.64 carats, presented in an elegant oval outline with dimensions 18.11 millimeters by 13.17 millimeters by 7.75 millimeters. The gem has been fashioned as a cabochon, a cutting choice that emphasizes color depth and internal tone rather than faceted brilliance. Color assessment places the piece in the intense category, with a stable brown hue and a medium dark tone combined with strong saturation. Clarity is uniformly translucent, allowing gentle light transmission that produces even color wash across the dome without obvious zoning. Surface finish is described as excellent, reflecting a high level of lapidary control in the final polish. No treatments or enhancements have been applied, a factor that preserves the natural state of the crystal structure and contributes to both aesthetic integrity and collector grade value. This specimen is offered through The Natural Gemstone Company, presented with provenance from Brazil, a region long associated with high quality quartz specimens.

The cabochon cut employed for this oval smoky quartz has been executed to exacting standards. The preform stage established a symmetric egg shaped outline with balanced length to width ratio that supports stable bezel settings. Dome curvature has been optimized to present the best color response for a translucent material, offering an even grade of light diffusion from edge to apex. The pavilion has been left flat to full in order to maximize apparent color depth while maintaining a comfortable thickness for wearable jewelry. During cutting, progressive abrasive stages were used from coarse to fine grits, followed by precision polishing using diamond paste and a cerium oxide final finish where appropriate, to achieve the excellent surface luster observed. The result is a cabochon with clean culet alignment, minimal surface undulation, and a polish that yields soft chatoyancy when viewed under directional lighting, a desirable attribute for designers seeking subtle visual movement without faceted scintillation.

From a gemological perspective this smoky quartz exhibits the characteristic optical and physical parameters of SiO2 based quartz. Refractive indices fall within the typical range for quartz, contributing to modest dispersion and a stable, soft sheen under directional light. Birefringence is low, so the cabochon appearance remains free of optical doubling or strain related distortion in normal viewing conditions. Specific gravity approximates standard quartz values, providing predictable heft in setting and useful tactile feedback for designers choosing metal weight and backing. Hardness rated at seven on the Mohs scale indicates robust wearability for ring, pendant, or bracelet applications, while still allowing experienced lapidaries to perform final setting adjustments. Weak pleochroism can be present in some smoky quartz examples, but the cabochon surface and uniform translucence of this piece minimize the perception of color change, resulting instead in a steady, enveloping brown tone that reads consistently in most lighting situations.

The Brazilian origin of this smoky quartz materially enhances its desirability and market value. Brazil is globally recognized for producing large, well formed quartz crystals from pegmatitic and hydrothermal environments, where slow cooling and the availability of trace elements permit the development of intense, uniformly colored material. Natural irradiation processes within host rock, often acting on aluminum substituted into the quartz lattice, create the smoky coloration that is prized in collectors grade specimens. Provenance from Brazil therefore signals a geological history that favors large, inclusion free growth and tonal stability, attributes that collectors and high end designers actively seek. Because this cabochon is untreated, its color and clarity are verifiable as natural, a premium quality factor in both retail and appraisal contexts. The Natural Gemstone Company can provide detailed documentation of origin and grading observations upon request, and this piece is particularly well suited for settings that celebrate its size and color uniformity, such as a sculpted bezel in warm yellow gold to enhance the brown saturation, or a minimalist platinum mount to emphasize form and polish. For customers and designers who prioritize geological provenance, cutting craftsmanship, and unenhanced material integrity, this 13.64 carat Brazilian smoky quartz cabochon represents a technically refined and visually compelling choice.