4.76 Ct. Green Prasiolite from Brazil

This 4.76 carat, transparent round prasiolite presents exacting proportions at 11.00 by 11.24 by 7.25 millimeters, faceted in a mixed brilliant style that marries a facet-rich crown with a stepped pavilion to maximize both scintillation and broad light return. Originating from Brazil and heat treated to stabilize its light green tone, this stone displays a light color intensity with even saturation across the table and crown. The gem is graded eye clean at standard loupe and unaided eye inspection, and it benefits from an excellent polish that minimizes surface diffusion and preserves crisp facet junctions. As a quartz species, prasiolite crystallizes in the trigonal system with a refractive index in the range typical for quartz, low birefringence, and minimal dispersion, attributes that favor sharp, mirror-like reflections when precision cutting and polish are applied.

The mixed brilliant cut and the measured depth of 7.25 millimeters relative to an average diameter of approximately 11.12 millimeters yields a depth ratio near 65 percent, creating a relatively deep pavilion architecture that strengthens internal reflection and enhances the gem’s three-dimensional sparkle. Light entering the table is captured by the crown’s well-defined star and bezel facets, then returned through the crown after controlled multiple internal reflections from the pavilion steps, producing a balance of brightness and lively facet contrast rather than high fire, which is naturally modest in quartz. The absence of true cleavage in quartz allows cutters to establish sharp facet edges and exacting facet angles without the risk of flaking, and the excellent polish here further increases specular reflection, producing crisp flashes and a stable, lively scintillation pattern. For the technically minded collector or designer, this prasiolite from The Natural Gemstone Company represents a combination of material integrity, deliberate cutting geometry, and surface finishing that together generate a clarity of light and an interplay of reflections that few stones of comparable type and size achieve.