15.63 Ct. White Quartz from Brazil

This transparent oval white quartz presents a rare combination of substantial weight and precise proportions, offering a measuring reference that is valuable to connoisseurs. The stone weighs 15.63 carat, with calibrated dimensions of 20.63 x 14.04 x 9.82 mm, yielding a length to width ratio of approximately 1.47. This elongated oval silhouette sits in a dimension range that is visually commanding without being cumbersome, and the 9.82 mm pavilion depth produces a depth to average diameter ratio of approximately 56.7 percent, a proportion that supports controlled return of light while maintaining a flat enough profile for comfortable settings. The combination of these dimensions and the 15.63 carat weight situates the gem in a size class that is uncommon for eye clean, colorless quartz, and this scale directly contributes to both the perceived presence of the stone in jewelry and its rarity profile among natural, untreated quartz specimens.

The cutting style is faceted, executed as a mixed brilliant cut, and the precision of the faceting is readily apparent in both face up and profile views. The mixed brilliant approach utilizes a brilliant style crown to maximize scintillation and a pavilion arrangement engineered to balance light return and dispersion, yielding a lively play of white flashes across the table and facets. Facet junctions are well aligned and symmetry is consistent around the girdle, evidence of careful lapidary work that supports the excellent polish grade. Clarity is graded as very very slightly included, evaluated at eye level, which for practical purposes reads as effectively eye clean, particularly important in a stone of this size where inclusions can otherwise disrupt facet reflections. Color intensity is colorless, and no enhancement has been applied to alter the natural state of the material. Origin is Brazil, a source known for producing high quality clear quartz, and the combination of natural colorlessness and the absence of treatments preserves the integrity of the stone for both collectors and jewelry designers.

The weight of 15.63 carat is a defining characteristic that elevates this white quartz beyond common market offerings, and the impact of this mass is both quantitative and qualitative. Quantitatively, quartz is an abundant mineral, but large, transparent, and eye clean specimens free from enhancement are relatively scarce, so per carat value does not scale linearly with size in quartz the way it does in certain rarer gem species. A single cut and polished stone at 15.63 carat commands interest because it enables substantial visual impact in a single piece rather than requiring multiple smaller stones to achieve similar presence. Qualitatively, a gem of this weight changes the design vocabulary available to jewelers, allowing for bold solitaire rings, statement pendants, or high profile cocktail rings where the table and facet architecture become focal points. The elongated oval footprint and the strong depth proportion provide practical advantages in mounting, as the stone can be secured with discreet prongs or a protective bezel without sacrificing face up brilliance, and the relatively shallow 56.7 percent depth reduces the risk of an overly deep pavilion that can trap light and diminish sparkle.

For buyers who evaluate gemstones from a technical perspective, this white quartz exemplifies how weight, cut, and material quality interact to define both aesthetic performance and market positioning. The precise dimensions and mixed brilliant faceting yield exceptional light return for quartz, the very very slightly included clarity at eye level ensures that the stone reads clean to most viewers, and the colorless intensity combined with no enhancement from Brazil provides an honest natural provenance that collectors value. At The Natural Gemstone Company we emphasize these measurable attributes because they inform setting choices, appraisal considerations, and long term desirability. If you require additional technical data such as facet count, exact table percentage, or recommendations for ring shank width and prong placement for this 20.63 by 14.04 by 9.82 mm, 15.63 carat oval mixed brilliant quartz, our specialists are available to provide tailored guidance and high resolution imagery to assist in design and valuation.