10.36 Ct. Bluish Green Prasiolite from Brazil

This specimen is a transparent prasiolite weighing 10.36 carats, presented in a classical oval outline, with dimensions of 15.82 by 13.35 by 7.91 millimeters, originating from Brazil. The material exhibits a delicate bluish green hue with light color intensity, consistent saturation and minimal color zoning, stabilized by controlled heat treatment. Clarity is graded as eye clean when examined at typical viewing distances, indicating that no inclusions materially interrupt the path of light to the naked eye. The cut is a mixed brilliant style, executed to optimize the interplay between table size, crown and pavilion architecture, and the intrinsic optical constants of quartz. The piece has an excellent polish, with crisp facet junctions, a uniform girdle profile in the thin to medium range, and symmetry within acceptable tolerances for a high quality collector gemstone supplied by The Natural Gemstone Company.

The chosen mixed brilliant faceting is a deliberate response to quartz refractive index values in the approximate range of 1.544 to 1.553 and the relatively low dispersion of the species. In practice this means maximizing facet geometry to enhance overall light return and internal contrast rather than relying on fire, which is naturally modest in prasiolite. The crown is faceted with a combination of kite and star shaped facets that transition to a well proportioned table, allowing for strong penetration of incident light and even color distribution across the oval. The pavilion adopts a modified brilliant schema with carefully controlled pavilion angles and facet planes arranged to redirect light back through the crown, creating broad flashes and attractive scintillation typical of oval mixed brilliants. Attention to pavilion depth was applied to avoid light leakage common in shallow or overly deep cuts, preserving weight while maintaining optimal internal reflection. Facet size and configuration were chosen to harmonize scintillation with the stone size, producing both larger flashes under softer illumination and lively pin fire under focused light, thereby accentuating the bluish green body color rather than dispersing it into faint spectral fragments.

Craftsmanship details further enhance the stone performance, the excellent polish reduces surface scattering and increases specular reflection, which contributes to a clean, glassy face up appearance. The eye clean clarity grade ensures that light paths are not interrupted by significant inclusions, permitting uninterrupted internal reflections and enhancing perceived brilliance and transparency of the 10.36 carat oval. Heat treatment has been applied in a controlled manner to adjust the original tone and green saturation, producing the stable bluish green that the cutter oriented to the table to maximize even color presentation across the oval axis. For set design considerations, an open back or low profile prong mount will maximize upward light return and maintain the lively visual performance of the mixed brilliant faceting, while a halo of small white stones can increase apparent size and perceived color depth without masking the stone character. For more protective applications a partial bezel combined with high prongs over the long axis will preserve the optics while ensuring security. The Natural Gemstone Company stands behind the provenance and measurements supplied, and we can provide further technical data and setting recommendations to integrate this prasiolite into bespoke jewelry designs, ensuring that the faceting and finish we describe translate into the intended light performance in your chosen mounting.