13.15 Ct. Cabochon Quartz from Brazil

This piece from The Natural Gemstone Company is a 13.15 carat marquise shape brown quartz, with exact dimensions of 23.98 x 12.19 x 6.96 mm, cabochon cut, semi translucent, intense in color intensity, and exhibiting an excellent polish. Origin is Brazil, enhancement is none, and the specimen presents a uniform warm brown hue with subtle internal light diffusion rather than discrete facet reflections. The cabochon dome produces a smooth, continuous optical field, the surface lacquer like finish showing a vitreous to subvitreous luster, and the semi translucent body allows for controlled light transmission which deepens the apparent saturation when viewed face up.

From a lapidary and technical perspective the marquise cabochon requires exacting geometry to preserve symmetry and to protect the acute points. The cutter has maintained proportional crown height relative to length and width to balance depth of color and visual spread, resulting in a profile that maximizes the stone window without over flattening the dome. The tip termination is carefully rounded to reduce susceptibility to chipping while preserving the elegant marquise outline, and the girdle region is even and smoothly integrated into the dome profile to allow precise setting. Workflows employed include accurate preform shaping on diamond laps, progressive sanding through fine abrasives to remove facet remnants, and a final mechanical polish that produces the high gloss surface, ensuring excellent polish quality and minimizing surface abrasion marks. The absence of enhancements guarantees natural color stability, and the Brazilian provenance aligns with known quartz material that often exhibits clean body color with minimal treatment.

For application and mounting this marquise cabochon is well suited to bezel settings where the continuous metal rim will protect the points, or to custom partial bezel and prong designs that employ reinforced end caps to secure the terminations. The stone dimensions and substantial crown height make it an ideal focal element for rings, pendants, or bespoke brooches where the elongated marquise outline accentuates finger length or neckline lines. Designers should consider contrast metals, as warmer brown tones often pair with yellow and rose gold to enhance apparent saturation, while palladium and white gold provide a contemporary, subdued presentation. The Natural Gemstone Company can provide additional photos and setting recommendations on request, and we guarantee natural origin and no enhancement for this specimen.