5.88 Ct. Bluish Green Prasiolite from Brazil

This 5.88 carat oval prasiolite offered by The Natural Gemstone Company is a technical exemplar for collectors and designers who prioritize precise material characteristics, clarity, and cutting geometry. The stone measures 13.27 by 10.79 by 7.32 millimeters, yielding a length to width ratio of 1.23 and a depth that measures 60.9 percent relative to the average diameter. These proportions sit within the optimal range for oval mixed brilliant cutting, preserving a broad table for stable light return while maintaining sufficient pavilion depth for controlled scintillation. The faceting style is mixed brilliant, with a brilliant crown arrangement to enhance dispersion and a modified pavilion layout to anchor contrast and depth. The excellent polish across all facet junctions ensures minimal surface diffusion, allowing the stone to exhibit crisp facet reflections under directional lighting, and the cutting execution demonstrates precise symmetry and consistently proportioned facets that maximize both face up color and internal brightness.

Optically this prasiolite displays a transparent body with intense bluish green color saturation that is notably rare for quartz varieties of comparable size. Typical prasiolite examples encountered in the trade often present paler green tones or yellowish green hues, especially above three carats, making a saturated bluish green at 5.88 carats an exceptional find. The gem was evaluated as eye clean at standard viewing distance, indicating an absence of inclusions that interfere with visibility to the unaided eye, which is uncommon in larger quartz pieces where internal zoning or crystal trapped phases frequently appear. Refractive properties typical of quartz are present, with a refractive index range consistent with natural prasiolite, and a specific gravity compatible with crystalline quartz, attributes that support predictable behavior under gemological instruments. The material has been heat treated in a controlled manner, an accepted enhancement in the trade to stabilize and intensify green tones in prasiolite, and the treatment is stable to normal wear conditions and standard jewelry setting processes.

From a design and setting perspective the gem is exceptionally versatile, suitable for a substantial solitaire or as the centerpiece of a bespoke three stone or halo composition, while retaining comfortable proportions for a wide range of ring styles and pendant designs. The mixed brilliant faceting on the crown contributes to lively fire and broad flash, while the pavilion design adds depth and a windowing resistance that is important for broader tables on oval stones. The excellent polish reduces the need for aggressive protective bezels in daily wear pieces, although a well considered setting that protects the girdle and crown angles will preserve the integrity of the polish and maintain the stone eye clean appearance over time. The intense bluish green hue pairs well with both warm and cool metal choices, and the uniform color distribution across the table ensures consistent saturation even under varied lighting conditions, a characteristic that enhances predictability for designers and end clients alike.

Rarity is a central selling point for this prasiolite, both in terms of physical size and chromatic character, making it a sought after specimen for collectors who track unusual quartz phenotypes or for jewelers who require a statement quality green quartz that stands apart from standard market material. Sourced from Brazil, a region known for producing high quality quartz materials, the stone benefits from provenance that aligns with rigorous cutting and finishing traditions, and the heat treatment employed conforms to industry practices intended to unlock and stabilize the most desirable color. For buyers who require technical assurance, The Natural Gemstone Company can provide measurements, viewing condition notes, and heat treatment disclosure, facilitating informed selection for high end production or private collections. This prasiolite represents a confluence of size, color intensity, cutting precision, and polish that is rarely assembled in a single stone, offering a durable, predictable, and visually striking option for advanced gemstone applications.